Bump rubocop-rails from 2.11.2 to 2.11.3

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.11.2 to 2.11.3.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rails/compare/v2.11.2...v2.11.3)

---
updated-dependencies:
- dependency-name: rubocop-rails
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -285,7 +285,7 @@ GEM
     pagedown-bootstrap-rails (2.1.4)
       railties (> 3.1)
     parallel (1.20.1)
-    parser (3.0.1.1)
+    parser (3.0.2.0)
       ast (~> 2.4.1)
     path_expander (1.1.0)
     pg (1.2.3)
@@ -420,7 +420,7 @@ GEM
     rubocop-performance (1.11.4)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.11.2)
+    rubocop-rails (2.11.3)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)