Bump rubocop-rails from 2.15.2 to 2.17.4

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.15.2 to 2.17.4.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.15.2...v2.17.4)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -182,7 +182,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.6.2)
+    json (2.6.3)
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.2)
@@ -245,7 +245,7 @@ GEM
     paper_trail-association_tracking (2.1.3)
       paper_trail (< 12.0)
     parallel (1.22.1)
-    parser (3.1.2.1)
+    parser (3.2.0.0)
       ast (~> 2.4.1)
     passenger (6.0.17)
       rack
@@ -310,7 +310,7 @@ GEM
       ffi (~> 1.0)
     recaptcha (5.12.3)
       json
-    regexp_parser (2.6.0)
+    regexp_parser (2.6.2)
     request_store (1.5.1)
       rack (>= 1.4)
     responders (3.0.1)
@@ -327,12 +327,12 @@ GEM
       rubocop-ast (>= 1.23.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.23.0)
+    rubocop-ast (1.24.1)
       parser (>= 3.1.1.0)
-    rubocop-rails (2.15.2)
+    rubocop-rails (2.17.4)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
-      rubocop (>= 1.7.0, < 2.0)
+      rubocop (>= 1.33.0, < 2.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -380,7 +380,7 @@ GEM
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (2.3.0)
+    unicode-display_width (2.4.2)
     unicode_utils (1.4.0)
     warden (1.2.9)
       rack (>= 2.0.9)