Merge pull request #80 from Shopify/dependabot/bundler/mocha-2.0.4

Bump mocha from 2.0.2 to 2.0.4

Author: github-actions[bot]

Gemfile.lock

@@ -105,7 +105,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     minitest (5.18.0)
-    mocha (2.0.2)
+    mocha (2.0.4)
       ruby2_keywords (>= 0.0.5)
     net-imap (0.3.4)
       date