Bump rubocop-rspec from 2.6.0 to 2.7.0

Bumps [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) from 2.6.0 to 2.7.0.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rspec/compare/v2.6.0...v2.7.0)

---
updated-dependencies:
- dependency-name: rubocop-rspec
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -185,13 +185,13 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.10.3)
-    rubocop (1.23.0)
+    rubocop (1.24.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.12.0, < 2.0)
+      rubocop-ast (>= 1.15.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.15.0)
@@ -200,7 +200,7 @@ GEM
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
-    rubocop-rspec (2.6.0)
+    rubocop-rspec (2.7.0)
       rubocop (~> 1.19)
     ruby-progressbar (1.11.0)
     ruby-vips (2.1.4)