Bump nokogiri from 1.8.1 to 1.10.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.1 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@v1.8.1...v1.10.4)

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

Gemfile.lock

@@ -159,7 +159,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.10.3)
     minitest-reporters (1.1.19)
       ansi
@@ -179,8 +179,8 @@ GEM
     naught (1.1.0)
     newrelic_rpm (4.6.0.338)
     nio4r (2.1.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     oauth (0.5.3)
     oauth2 (1.4.0)
       faraday (>= 0.8, < 0.13)