Bump nokogiri from 1.6.3.1 to 1.10.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.6.3.1 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@v1.6.3.1...v1.10.4)

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

Author: dependabot[bot]

Gemfile.lock

@@ -39,14 +39,14 @@ GEM
       rb-inotify (>= 0.9)
     lumberjack (1.0.9)
     method_source (0.8.2)
-    mini_portile (0.6.0)
+    mini_portile2 (2.4.0)
     multi_json (1.11.2)
     nanoc (3.7.3)
       cri (~> 2.3)
     nanoc-cachebuster (0.3.1)
       nanoc (>= 3.3.0)
-    nokogiri (1.6.3.1)
-      mini_portile (= 0.6.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     posix-spawn (0.3.9)
     pry (0.10.1)
       coderay (~> 1.1.0)
@@ -79,7 +79,7 @@ GEM
     thor (0.19.1)
     timers (4.0.1)
       hitimes
-    yajl-ruby (1.3.0)
+    yajl-ruby (1.1.0)
 
 PLATFORMS
   ruby