Bump rubocop-rails from 2.22.1 to 2.22.2

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.22.1 to 2.22.2.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.22.1...v2.22.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -86,7 +86,7 @@ GEM
     ast (2.4.2)
     auto_strip_attributes (2.6.0)
       activerecord (>= 4.0)
-    base64 (0.1.1)
+    base64 (0.2.0)
     bcrypt (3.1.19)
     better_errors (2.10.1)
       erubi (>= 1.0.0)
@@ -119,7 +119,7 @@ GEM
     dotenv-rails (2.8.1)
       dotenv (= 2.8.1)
       railties (>= 3.2)
-    drb (2.1.1)
+    drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)
     ffi (1.15.5)
@@ -167,7 +167,7 @@ GEM
     multi_json (1.15.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    mutex_m (0.1.2)
+    mutex_m (0.2.0)
     net-imap (0.4.1)
       date
       net-protocol
@@ -197,7 +197,7 @@ GEM
       stringio
     puma (6.4.0)
       nio4r (~> 2.0)
-    racc (1.7.1)
+    racc (1.7.3)
     rack (2.2.8)
     rack-protection (3.1.0)
       rack (~> 2.2, >= 2.2.4)
@@ -307,10 +307,11 @@ GEM
     rubocop-performance (1.19.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.22.1)
+    rubocop-rails (2.22.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
     rubocop-rspec (2.25.0)
       rubocop (~> 1.40)
       rubocop-capybara (~> 2.17)