diff --git a/Gemfile b/Gemfile
index a26c551..55ed35c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "3.5.1"
+gem "jekyll", "~> 3.5"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "minima", "~> 2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 315c81f..6890953 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.4)
+    activesupport (5.2.0)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.5.2)
@@ -12,164 +12,175 @@ GEM
       i18n
     builder (3.2.3)
     colorator (1.1.0)
-    colored (1.2)
+    colorize (0.8.1)
     concurrent-ruby (1.0.5)
+    connection_pool (2.2.2)
     diff-lcs (1.3)
-    ebnf (1.1.1)
-      rdf (~> 2.2)
+    ebnf (1.1.2)
+      rdf (>= 2.2, < 4.0)
       sxp (~> 1.0)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
     equivalent-xml (0.6.0)
       nokogiri (>= 1.4.3)
-    ethon (0.10.1)
+    ethon (0.11.0)
       ffi (>= 1.3.0)
-    ffi (1.9.18)
+    eventmachine (1.2.7)
+    ffi (1.9.25)
     forwardable-extended (2.6.0)
-    haml (5.0.2)
+    haml (5.0.4)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    html-proofer (3.7.2)
+    html-proofer (3.9.1)
       activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
-      colored (~> 1.2)
+      colorize (~> 0.8)
       mercenary (~> 0.3.2)
-      nokogiri (~> 1.7)
+      nokogiri (~> 1.8.1)
       parallel (~> 1.3)
-      typhoeus (~> 0.7)
+      typhoeus (~> 1.3)
       yell (~> 2.0)
     htmlentities (4.3.4)
-    i18n (0.8.6)
-    jekyll (3.5.1)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.8.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (~> 1.7)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.5.0)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-watch (1.5.0)
-      listen (~> 3.0, < 3.1)
-    json-ld (2.1.5)
+    jekyll-watch (2.0.0)
+      listen (~> 3.0)
+    json-ld (2.2.1)
       multi_json (~> 1.12)
-      rdf (~> 2.2)
-    json-ld-preloaded (1.1.0)
-      json-ld (~> 2.1)
-      multi_json (~> 1.11)
-      rdf (~> 2.2)
-    kramdown (1.14.0)
-    ld-patch (0.3.2)
-      ebnf (~> 1.0, >= 1.0.1)
-      rdf (~> 2.0)
-      rdf-xsd (~> 2.0)
-      sparql (~> 2.0)
+      rdf (>= 2.2.8, < 4.0)
+    json-ld-preloaded (3.0.0)
+      json-ld (>= 2.2, < 4.0)
+      multi_json (~> 1.12)
+      rdf (~> 3.0)
+    kramdown (1.17.0)
+    ld-patch (0.3.3)
+      ebnf (~> 1.1)
+      rdf (>= 2.2, < 4.0)
+      rdf-xsd (>= 2.2, < 4.0)
+      sparql (>= 2.2, < 4.0)
       sxp (~> 1.0)
     link_header (0.0.8)
-    linkeddata (2.2.3)
+    linkeddata (3.0.0)
       equivalent-xml (~> 0.6)
-      json-ld (~> 2.1)
-      ld-patch (~> 0.3)
-      nokogiri (~> 1.7)
-      rdf (~> 2.2)
-      rdf-aggregate-repo (~> 2.1)
-      rdf-isomorphic (~> 2.0)
-      rdf-json (~> 2.0)
-      rdf-microdata (~> 2.1)
-      rdf-n3 (~> 2.1)
-      rdf-normalize (~> 0.3)
-      rdf-rdfa (~> 2.1)
-      rdf-rdfxml (~> 2.0)
-      rdf-reasoner (~> 0.4)
-      rdf-tabular (~> 2.2)
-      rdf-trig (~> 2.0)
-      rdf-trix (~> 2.0)
-      rdf-turtle (~> 2.2)
-      rdf-vocab (~> 2.1)
-      rdf-xsd (~> 2.1)
-      shex (~> 0.5)
-      sparql (~> 2.1)
-      sparql-client (~> 2.1)
+      json-ld (>= 2.2.1, < 4.0)
+      ld-patch (~> 0.3, >= 0.3.3)
+      nokogiri (~> 1.8)
+      rdf (~> 3.0)
+      rdf-aggregate-repo (>= 2.2.1, < 4.0)
+      rdf-isomorphic (~> 3.0)
+      rdf-json (>= 2.2, < 4.0)
+      rdf-microdata (>= 2.2.3, < 4.0)
+      rdf-n3 (>= 2.2, < 4.0)
+      rdf-normalize (~> 0.3, >= 0.3.3)
+      rdf-rdfa (>= 2.2.4, < 4.0)
+      rdf-rdfxml (>= 2.2.1, < 4.0)
+      rdf-reasoner (~> 0.5.0)
+      rdf-tabular (>= 2.2.1, < 4.0)
+      rdf-trig (>= 2.2, < 4.0)
+      rdf-trix (>= 2.2.1, < 4.0)
+      rdf-turtle (~> 3.0)
+      rdf-vocab (~> 3.0)
+      rdf-xsd (~> 3.0)
+      shex (~> 0.5, >= 0.5.2)
+      sparql (~> 3.0)
+      sparql-client (~> 3.0)
     liquid (4.0.0)
-    listen (3.0.8)
+    listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.2.0)
+    mini_portile2 (2.3.0)
     minima (2.1.1)
       jekyll (~> 3.3)
-    minitest (5.10.2)
-    multi_json (1.12.1)
-    net-http-persistent (2.9.4)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
-    nokogumbo (1.4.13)
+    minitest (5.11.3)
+    multi_json (1.13.1)
+    net-http-persistent (3.0.0)
+      connection_pool (~> 2.2)
+    nokogiri (1.8.4)
+      mini_portile2 (~> 2.3.0)
+    nokogumbo (1.5.0)
       nokogiri
-    parallel (1.12.0)
-    pathutil (0.14.0)
+    parallel (1.12.1)
+    pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.0)
-    rb-fsevent (0.10.2)
+    public_suffix (3.0.2)
+    rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rdf (2.2.9)
+    rdf (3.0.2)
       hamster (~> 3.0)
       link_header (~> 0.0, >= 0.0.8)
-    rdf-aggregate-repo (2.2.0)
-      rdf (~> 2.0)
-    rdf-isomorphic (2.0.0)
-      rdf (~> 2.0)
-    rdf-json (2.0.0)
-      rdf (~> 2.0)
-    rdf-microdata (2.2.1)
+    rdf-aggregate-repo (2.2.1)
+      rdf (>= 2.2, < 4.0)
+    rdf-isomorphic (3.0.0)
+      rdf (~> 3.0)
+    rdf-json (2.2.0)
+      rdf (>= 2.2, < 4.0)
+    rdf-microdata (2.2.3)
       htmlentities (~> 4.3)
-      nokogiri (~> 1.7)
-      rdf (~> 2.2)
-      rdf-xsd (~> 2.1)
-    rdf-n3 (2.1.0)
-      rdf (~> 2.0)
-    rdf-normalize (0.3.2)
-      rdf (~> 2.0)
-    rdf-rdfa (2.2.3)
+      nokogiri (~> 1.8)
+      rdf (>= 2.2.8, < 4.0)
+      rdf-xsd (>= 2.2, < 4.0)
+    rdf-n3 (3.0.0)
+      rdf (~> 3.0)
+    rdf-normalize (0.3.3)
+      rdf (>= 2.2, < 4.0)
+    rdf-rdfa (3.0.1)
       haml (~> 5.0)
       htmlentities (~> 4.3)
-      rdf (~> 2.2)
-      rdf-aggregate-repo (~> 2.2)
-      rdf-xsd (~> 2.1)
-    rdf-rdfxml (2.2.0)
+      rdf (~> 3.0)
+      rdf-aggregate-repo (>= 2.2, < 4.0)
+      rdf-xsd (~> 3.0)
+    rdf-rdfxml (2.2.1)
       htmlentities (~> 4.3)
-      rdf (~> 2.0)
-      rdf-rdfa (~> 2.0)
-      rdf-xsd (~> 2.0)
-    rdf-reasoner (0.4.3)
-      rdf (~> 2.2, >= 2.2.8)
-      rdf-vocab (~> 2.2)
-      rdf-xsd (~> 2.1)
-    rdf-tabular (2.2.0)
+      rdf (>= 2.2, < 4.0)
+      rdf-rdfa (>= 2.2, < 4.0)
+      rdf-xsd (>= 2.2, < 4.0)
+    rdf-reasoner (0.5.1)
+      rdf (~> 3.0)
+      rdf-vocab (~> 3.0)
+      rdf-xsd (~> 3.0)
+    rdf-tabular (2.2.1)
       addressable (~> 2.3)
       bcp47 (~> 0.3, >= 0.3.3)
-      json-ld (~> 2.0)
-      rdf (~> 2.1)
-      rdf-vocab (~> 2.0)
-      rdf-xsd (~> 2.0)
-    rdf-trig (2.0.0)
+      json-ld (>= 2.1, < 4.0)
+      rdf (>= 2.2, < 4.0)
+      rdf-vocab (>= 2.2, < 4.0)
+      rdf-xsd (>= 2.2, < 4.0)
+    rdf-trig (2.2.0)
       ebnf (~> 1.0, >= 1.0.1)
-      rdf (~> 2.0)
-      rdf-turtle (~> 2.0)
-    rdf-trix (2.0.0)
-      rdf (~> 2.0)
-    rdf-turtle (2.2.0)
+      rdf (>= 2.2, < 4.0)
+      rdf-turtle (>= 2.2, < 4.0)
+    rdf-trix (2.2.1)
+      rdf (>= 2.2, < 4.0)
+    rdf-turtle (3.0.1)
       ebnf (~> 1.1)
-      rdf (~> 2.2)
-    rdf-vocab (2.2.6)
-      rdf (~> 2.2)
-    rdf-xsd (2.2.0)
-      rdf (~> 2.1)
-    rouge (1.11.1)
+      rdf (~> 3.0)
+    rdf-vocab (3.0.3)
+      rdf (~> 3.0)
+    rdf-xsd (3.0.0)
+      rdf (~> 3.0)
+    rouge (3.1.1)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -184,39 +195,40 @@ GEM
       rspec-support (~> 3.6.0)
     rspec-structured_data_matcher (0.1.0)
     rspec-support (3.6.0)
+    ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.1)
+    sass (3.5.6)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    shex (0.5.0)
+    shex (0.5.2)
       ebnf (~> 1.1)
-      json-ld (~> 2.1)
-      json-ld-preloaded (~> 1.0)
-      rdf (~> 2.2)
-      rdf-xsd (~> 2.0)
-      sparql (~> 2.0)
+      json-ld (>= 2.2, < 4.0)
+      json-ld-preloaded (>= 2.2, < 4.0)
+      rdf (>= 2.2, < 4.0)
+      rdf-xsd (>= 2.2, < 4.0)
+      sparql (>= 2.2, < 4.0)
       sxp (~> 1.0)
-    sparql (2.2.1)
+    sparql (3.0.1)
       builder (~> 3.2)
       ebnf (~> 1.1)
-      rdf (~> 2.2)
-      rdf-aggregate-repo (~> 2.2)
-      rdf-xsd (~> 2.1)
-      sparql-client (~> 2.1)
+      rdf (~> 3.0)
+      rdf-aggregate-repo (>= 2.2, < 4.0)
+      rdf-xsd (~> 3.0)
+      sparql-client (~> 3.0)
       sxp (~> 1.0)
-    sparql-client (2.1.0)
-      net-http-persistent (~> 2.9)
-      rdf (~> 2.0)
-    sxp (1.0.0)
-      rdf (~> 2.0)
+    sparql-client (3.0.0)
+      net-http-persistent (>= 2.9, < 4)
+      rdf (~> 3.0)
+    sxp (1.0.1)
+      rdf (>= 2.2, < 4.0)
     temple (0.8.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    typhoeus (0.8.0)
-      ethon (>= 0.8.0)
-    tzinfo (1.2.3)
+    typhoeus (1.3.0)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     yell (2.0.7)
 
@@ -225,7 +237,7 @@ PLATFORMS
 
 DEPENDENCIES
   html-proofer
-  jekyll (= 3.5.1)
+  jekyll (~> 3.5)
   linkeddata
   minima (~> 2.0)
   nokogumbo
@@ -234,4 +246,4 @@ DEPENDENCIES
   tzinfo-data
 
 BUNDLED WITH
-   1.15.4
+   1.16.1