Update rubocop requirement from ~> 1.8.0 to ~> 1.9.0 (#48)

Updates the requirements on [rubocop](https://github.com/rubocop-hq/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.8.1...v1.9.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -8,7 +8,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.1)
+    ast (2.4.2)
     coveralls (0.8.23)
       json (>= 1.8, < 3)
       simplecov (~> 0.16.1)
@@ -39,7 +39,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.0)
-    rubocop (1.8.1)
+    rubocop (1.9.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -48,7 +48,7 @@ GEM
       rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.4.0)
+    rubocop-ast (1.4.1)
       parser (>= 2.7.1.5)
     ruby-progressbar (1.11.0)
     simplecov (0.16.1)
@@ -74,7 +74,7 @@ DEPENDENCIES
   coveralls (~> 0.8.23)
   rake (~> 13.0.1)
   rspec-sonarqube-formatter!
-  rubocop (~> 1.8.0)
+  rubocop (~> 1.9.0)
   simplecov (~> 0.16.1)
   simplecov-json (~> 0.2.0)
 

rspec-sonarqube-formatter.gemspec

@@ -39,7 +39,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler',        '~> 2.2.0'
   spec.add_development_dependency 'coveralls',      '~> 0.8.23'
   spec.add_development_dependency 'rake',           '~> 13.0.1'
-  spec.add_development_dependency 'rubocop',        '~> 1.8.0'
+  spec.add_development_dependency 'rubocop',        '~> 1.9.0'
   spec.add_development_dependency 'simplecov',      '~> 0.16.1'
   spec.add_development_dependency 'simplecov-json', '~> 0.2.0'
 end