Merge pull request #12 from githubtraining/dependabot/bundler/nokogiri-1.10.8

Author: dependabot[bot]

Gemfile.lock

@@ -214,7 +214,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.13.0)
     multipart-post (2.1.1)
-    nokogiri (1.10.5)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)