Bump rubocop from 0.64.0 to 0.66.0 (#112)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.64.0 to 0.66.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.64.0...v0.66.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -80,6 +80,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
+    jar-dependencies (0.4.0)
     jaro_winkler (1.5.2)
     jaro_winkler (1.5.2-java)
     loofah (2.2.3)
@@ -103,17 +104,19 @@ GEM
     nokogiri (1.10.2-java)
     octokit (4.13.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.13.0)
+    parallel (1.14.0)
     parser (2.6.0.0)
       ast (~> 2.4.0)
-    powerpack (0.1.2)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     pry (0.12.2-java)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
       spoon (~> 0.0)
+    psych (3.1.0)
+    psych (3.1.0-java)
+      jar-dependencies (>= 0.1.7)
     public_suffix (3.0.3)
     rack (2.0.6)
     rack-test (1.1.0)
@@ -166,14 +169,14 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    rubocop (0.64.0)
+    rubocop (0.66.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
+      psych (>= 3.1.0)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.4.0)
+      unicode-display_width (>= 1.4.0, < 1.6)
     ruby-progressbar (1.10.0)
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
@@ -192,7 +195,7 @@ GEM
     thread_safe (0.3.6-java)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unicode-display_width (1.4.1)
+    unicode-display_width (1.5.0)
     websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-driver (0.7.0-java)