Merge pull request #300 from MITLibraries/renovate/mocha-3.x-lockfile

Update dependency mocha to v3

Author: jazairi

Gemfile.lock

@@ -242,7 +242,7 @@ GEM
     matrix (0.4.2)
     mini_mime (1.1.5)
     minitest (5.27.0)
-    mocha (2.8.2)
+    mocha (3.0.1)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.8.0)
     multi_json (1.15.0)