Bump kramdown from 1.15.0 to 2.3.0

Bumps [kramdown](https://github.com/gettalong/kramdown) from 1.15.0 to 2.3.0.
- [Release notes](https://github.com/gettalong/kramdown/releases)
- [Changelog](https://github.com/gettalong/kramdown/blob/master/doc/news.page)
- [Commits](https://github.com/gettalong/kramdown/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -7,10 +7,10 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     ast (2.3.0)
-    claide (1.0.2)
+    claide (1.0.3)
     claide-plugins (0.9.2)
       cork
       nap
@@ -19,28 +19,30 @@ GEM
     colored2 (3.1.2)
     cork (0.3.0)
       colored2 (~> 3.1)
-    danger (5.5.2)
+    danger (8.0.4)
       claide (~> 1.0)
       claide-plugins (>= 0.9.2)
       colored2 (~> 3.1)
       cork (~> 0.1)
-      faraday (~> 0.9)
-      faraday-http-cache (~> 1.0)
-      git (~> 1)
-      kramdown (~> 1.5)
+      faraday (>= 0.9.0, < 2.0)
+      faraday-http-cache (~> 2.0)
+      git (~> 1.7)
+      kramdown (~> 2.0)
+      kramdown-parser-gfm (~> 1.0)
       no_proxy_fix
       octokit (~> 4.7)
       terminal-table (~> 1)
     danger-plugin-api (1.0.0)
       danger (> 2.0)
     diff-lcs (1.2.5)
-    faraday (0.13.1)
+    faraday (1.0.1)
       multipart-post (>= 1.2, < 3)
-    faraday-http-cache (1.3.1)
-      faraday (~> 0.8)
+    faraday-http-cache (2.2.0)
+      faraday (>= 0.8)
     ffi (1.9.14)
     formatador (0.2.5)
-    git (1.3.0)
+    git (1.7.0)
+      rchardet (~> 1.8)
     guard (2.14.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
@@ -55,20 +57,24 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
-    kramdown (1.15.0)
+    kramdown (2.3.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     listen (3.0.7)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9.7)
     lumberjack (1.0.10)
     method_source (0.8.2)
-    multipart-post (2.0.0)
+    multipart-post (2.1.1)
     nap (1.1.0)
     nenv (0.3.0)
-    no_proxy_fix (0.1.1)
+    no_proxy_fix (0.1.2)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    octokit (4.7.0)
+    octokit (4.18.0)
+      faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     open4 (1.3.4)
     parallel (1.12.1)
@@ -79,12 +85,14 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    public_suffix (3.0.0)
+    public_suffix (4.0.5)
     rainbow (3.0.0)
     rake (10.5.0)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
+    rchardet (1.8.0)
+    rexml (3.2.4)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
@@ -106,15 +114,15 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
+    sawyer (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
     shellany (0.0.1)
     slop (3.6.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thor (0.19.4)
-    unicode-display_width (1.1.3)
+    unicode-display_width (1.7.0)
     yard (0.9.12)
 
 PLATFORMS