Bump rubocop-rspec from 2.4.0 to 2.5.0

Bumps [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) from 2.4.0 to 2.5.0.
- [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/v2.4.0...v2.5.0)

---
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

@@ -286,7 +286,7 @@ GEM
       rack (>= 1.2, < 3)
     pagedown-bootstrap-rails (2.1.4)
       railties (> 3.1)
-    parallel (1.20.1)
+    parallel (1.21.0)
     parser (3.0.2.0)
       ast (~> 2.4.1)
     path_expander (1.1.0)
@@ -426,9 +426,8 @@ GEM
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
-    rubocop-rspec (2.4.0)
-      rubocop (~> 1.0)
-      rubocop-ast (>= 1.1.0)
+    rubocop-rspec (2.5.0)
+      rubocop (~> 1.19)
     ruby-progressbar (1.11.0)
     ruby-vips (2.1.3)
       ffi (~> 1.12)
@@ -504,7 +503,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.7)
-    unicode-display_width (2.0.0)
+    unicode-display_width (2.1.0)
     web-console (4.1.0)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)