Update rubocop plugins (#336)

- General bundle update.
- No docs updated this time.

Author: BrianHawley

Diff for: Gemfile.lock

@@ -55,18 +55,18 @@ GEM
       rubocop (>= 0.87, < 2)
     rubocop-i18n (3.0.0)
       rubocop (~> 1.0)
-    rubocop-minitest (0.22.0)
+    rubocop-minitest (0.22.1)
       rubocop (>= 0.90, < 2.0)
     rubocop-performance (1.15.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.16.0)
+    rubocop-rails (2.16.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
-    rubocop-rspec (2.13.1)
+    rubocop-rspec (2.13.2)
       rubocop (~> 1.33)
     rubocop-sequel (0.3.4)
       rubocop (~> 1.0)