Bump rubocop-rails from 2.24.1 to 2.25.1

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.24.1 to 2.25.1.
- [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/v2.24.1...v2.25.1)

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

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

Gemfile.lock

@@ -386,7 +386,7 @@ GEM
     mini_magick (4.12.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.7)
-    minitest (5.24.0)
+    minitest (5.24.1)
     moneta (1.0.0)
     msgpack (1.7.2)
     multi_json (1.15.0)
@@ -519,7 +519,7 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.3.0)
+    rexml (3.3.1)
       strscan
     rouge (4.1.2)
     rspec (3.13.0)
@@ -574,7 +574,7 @@ GEM
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.31.3)
       parser (>= 3.3.1.0)
-    rubocop-rails (2.24.1)
+    rubocop-rails (2.25.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)