Bump nokogiri from 1.8.5 to 1.10.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.5 to 1.10.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.8.5...v1.10.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -7,7 +7,7 @@ gem 'middleman-autoprefixer', '~> 2.7.0'
 gem "middleman-sprockets", "~> 4.1.1"
 gem 'rouge', '~> 2.0.7'
 gem 'redcarpet', '~> 3.4.0'
-gem 'nokogiri', '~> 1.8.5'
+gem 'nokogiri', '~> 1.10.4'
 gem 'execjs'
 gem 'therubyracer'
 gem 'sprockets', '~> 3.7.2'

Gemfile.lock

@@ -80,10 +80,10 @@ GEM
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
@@ -125,7 +125,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 2.7.0)
   middleman-sprockets (~> 4.1.1)
   middleman-syntax (~> 3.0.0)
-  nokogiri (~> 1.8.5)
+  nokogiri (~> 1.10.4)
   redcarpet (~> 3.4.0)
   rouge (~> 2.0.7)
   sprockets (~> 3.7.2)