chore(deps): bump nokogiri from 1.7.2 to 1.10.3 (c3js#2667)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.7.2 to 1.10.3.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.7.2...v1.10.3)

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

Author: dependabot[bot]

Gemfile.lock

@@ -224,12 +224,12 @@ GEM
     middleman-sync (3.0.12)
       asset_sync (~> 1.0.0)
       middleman-core (>= 3.0.0)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.4.0)
     multi_json (1.12.1)
-    nokogiri (1.7.2)
-      mini_portile2 (~> 2.1.0)
-    nokogiri (1.7.2-x86-mingw32)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.10.3)
+      mini_portile2 (~> 2.4.0)
+    nokogiri (1.10.3-x86-mingw32)
+      mini_portile2 (~> 2.4.0)
     rack (1.6.8)
     rack-livereload (0.3.16)
       rack