Bump nokogiri from 1.10.7 to 1.10.8 (#28)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.7 to 1.10.8.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.7...v1.10.8)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -207,11 +207,11 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.0)
     multipart-post (2.1.1)
-    nokogiri (1.10.7)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.7-x64-mingw32)
+    nokogiri (1.10.8-x64-mingw32)
       mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.7-x86-mingw32)
+    nokogiri (1.10.8-x86-mingw32)
       mini_portile2 (~> 2.4.0)
     octokit (4.15.0)
       faraday (>= 0.9)
@@ -243,7 +243,6 @@ GEM
     tzinfo (1.2.6)
       thread_safe (~> 0.1)
     unicode-display_width (1.6.1)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -258,7 +257,6 @@ DEPENDENCIES
   jekyll-seo-tag
   jekyll-sitemap
   nokogiri (>= 1.8.5)
-  wdm (>= 0.1.0)
 
 RUBY VERSION
    ruby 2.3.3p222