Bump rubocop from 1.4.1 to 1.4.2

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v1.4.1...v1.4.2)

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

Gemfile.lock

@@ -311,7 +311,7 @@ GEM
       rspec-mocks (~> 3.9)
       rspec-support (~> 3.9)
     rspec-support (3.9.4)
-    rubocop (1.4.1)
+    rubocop (1.4.2)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
       rainbow (>= 2.2.2, < 4.0)
@@ -320,7 +320,7 @@ GEM
       rubocop-ast (>= 1.1.1)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.1.1)
+    rubocop-ast (1.2.0)
       parser (>= 2.7.1.5)
     rubocop-rspec (2.0.0)
       rubocop (~> 1.0)