Bump nokogiri from 1.8.4 to 1.10.8

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.4 to 1.10.8.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.8.4...v1.10.8)

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

Author: dependabot[bot]

Gemfile

@@ -28,7 +28,7 @@ gem 'mailgun-ruby'
 gem 'meta-tags'
 gem 'mini_magick'
 gem 'mini_racer'
-gem 'nokogiri', '~> 1.8.2'
+gem 'nokogiri', '~> 1.10.8'
 gem 'pg', '~> 0.15'
 gem 'poltergeist'
 gem 'puma'

Gemfile.lock

@@ -221,16 +221,16 @@ GEM
     mimemagic (0.3.2)
     mini_magick (4.7.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     mini_racer (0.2.0)
       libv8 (>= 6.3)
     minitest (5.13.0)
     multi_json (1.14.1)
     multipart-post (2.0.0)
     netrc (0.11.0)
     nio4r (2.3.1)
-    nokogiri (1.8.4)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.8)
+      mini_portile2 (~> 2.4.0)
     numerizer (0.1.1)
     parallel (1.11.2)
     parser (2.4.0.0)
@@ -413,7 +413,7 @@ DEPENDENCIES
   meta-tags
   mini_magick
   mini_racer
-  nokogiri (~> 1.8.2)
+  nokogiri (~> 1.10.8)
   pg (~> 0.15)
   poltergeist
   puma