Bump rubocop from 0.66.0 to 0.67.2

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.66.0 to 0.67.2.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.66.0...v0.67.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -104,8 +104,8 @@ GEM
     minitest (5.11.3)
     nokogiri (1.10.1)
       mini_portile2 (~> 2.4.0)
-    parallel (1.15.0)
-    parser (2.6.2.0)
+    parallel (1.17.0)
+    parser (2.6.2.1)
       ast (~> 2.4.0)
     pi_piper (2.0.0)
       eventmachine (= 1.0.9)
@@ -166,7 +166,7 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    rubocop (0.66.0)
+    rubocop (0.67.2)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)