Bump rubocop from 0.86.0 to 0.87.0

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.86.0 to 0.87.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.86.0...v0.87.0)

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

Gemfile.lock

@@ -386,13 +386,13 @@ GEM
     rinku (2.0.6)
     rotp (6.0.0)
       addressable (~> 2.7)
-    rubocop (0.86.0)
+    rubocop (0.87.0)
       parallel (~> 1.10)
-      parser (>= 2.7.0.1)
+      parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.7)
       rexml
-      rubocop-ast (>= 0.0.3, < 1.0)
+      rubocop-ast (>= 0.1.0, < 1.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-ast (0.1.0)