Update rubocop requirement from ~> 0.52 to ~> 1.6

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@v0.58.1...v1.6.0)

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

Gemfile.lock

@@ -6,7 +6,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.0)
+    ast (2.4.1)
     coderay (1.1.2)
     coveralls (0.8.22)
       json (>= 1.8, < 3)
@@ -16,18 +16,18 @@ GEM
       tins (~> 1.6)
     diff-lcs (1.3)
     docile (1.3.1)
-    jaro_winkler (1.5.1)
     json (2.1.0)
     method_source (0.9.0)
-    parallel (1.12.1)
-    parser (2.5.1.2)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
+    parallel (1.20.1)
+    parser (2.7.2.0)
+      ast (~> 2.4.1)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     rainbow (3.0.0)
     rake (10.5.0)
+    regexp_parser (2.0.0)
+    rexml (3.2.4)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -41,17 +41,20 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    rubocop (0.58.1)
-      jaro_winkler (~> 1.5.1)
+    rubocop (1.6.0)
       parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
+      parser (>= 2.7.1.5)
       rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-ast (1.3.0)
+      parser (>= 2.7.1.5)
     rubocop-rspec (1.27.0)
       rubocop (>= 0.56.0)
-    ruby-progressbar (1.9.0)
+    ruby-progressbar (1.10.1)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
@@ -61,7 +64,7 @@ GEM
       tins (~> 1.0)
     thor (0.19.4)
     tins (1.16.3)
-    unicode-display_width (1.4.0)
+    unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
@@ -73,7 +76,7 @@ DEPENDENCIES
   pry
   rake (~> 10.0)
   rspec (~> 3.0)
-  rubocop (~> 0.52)
+  rubocop (~> 1.6)
   rubocop-rspec (~> 1.22)
 
 BUNDLED WITH

adaptor.gemspec

@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.16'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
-  spec.add_development_dependency 'rubocop', '~> 0.52'
+  spec.add_development_dependency 'rubocop', '~> 1.6'
   spec.add_development_dependency 'rubocop-rspec', '~> 1.22'
 end