Bump rubocop from 0.80.1 to 0.81.0

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.80.1 to 0.81.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.80.1...v0.81.0)

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

Gemfile.lock

@@ -120,7 +120,7 @@ GEM
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     parallel (1.19.1)
-    parser (2.7.0.3)
+    parser (2.7.1.0)
       ast (~> 2.4.0)
     pi_piper (2.0.0)
       eventmachine (= 1.0.9)
@@ -184,14 +184,14 @@ GEM
       rspec-mocks (~> 3.9.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
-    rubocop (0.80.1)
+    rubocop (0.81.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.7.0.1)
       rainbow (>= 2.2.2, < 4.0)
       rexml
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 1.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-rails (2.4.1)
       rack (>= 1.1)
       rubocop (>= 0.72.0)
@@ -232,7 +232,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
-    unicode-display_width (1.6.1)
+    unicode-display_width (1.7.0)
     webdrivers (4.2.0)
       nokogiri (~> 1.6)
       rubyzip (>= 1.3.0)