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

@@ -11,6 +11,10 @@ GEM
     cri (2.6.1)
       colored (~> 1.2)
     diff-lcs (1.2.5)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
     ffi (1.9.6)
     formatador (0.2.5)
     guard (2.6.1)
@@ -19,24 +23,30 @@ GEM
       lumberjack (~> 1.0)
       pry (>= 0.9.12)
       thor (>= 0.18.1)
+    guard-livereload (2.3.1)
+      em-websocket (~> 0.5)
+      guard (~> 2.0)
+      multi_json (~> 1.8)
     guard-nanoc (1.0.2)
       guard (>= 1.8.0)
       nanoc (>= 3.6.3)
     hitimes (1.2.2)
+    http_parser.rb (0.6.0)
     kramdown (1.4.2)
     listen (2.7.11)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
       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 (1.14.1)
     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)
@@ -69,7 +79,7 @@ GEM
     thor (0.19.1)
     timers (4.0.1)
       hitimes
-    yajl-ruby (1.3.0)
+    yajl-ruby (1.1.0)
 
 PLATFORMS
   ruby