Bump rubocop-rspec from 2.4.0 to 2.17.1

Bumps [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) from 2.4.0 to 2.17.1.
- [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...v2.17.1)

---
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

@@ -109,7 +109,7 @@ group :development do
   gem "rubocop", "~> 1.35.1", require: false
   gem "rubocop-performance", "~> 1.19.0", require: false
   gem "rubocop-rails", "~> 2.20.2", require: false
-  gem "rubocop-rspec", "~> 2.4.0", require: false
+  gem "rubocop-rspec", "~> 2.17.1", require: false
   gem "rvm1-capistrano3", "~> 1.4.0", require: false
   gem "scss_lint", "~> 0.60.0", require: false
   gem "web-console", "~> 4.2.0"

Gemfile.lock

@@ -532,9 +532,8 @@ GEM
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
-    rubocop-rspec (2.4.0)
-      rubocop (~> 1.0)
-      rubocop-ast (>= 1.1.0)
+    rubocop-rspec (2.17.1)
+      rubocop (~> 1.33)
     ruby-progressbar (1.13.0)
     ruby-vips (2.1.4)
       ffi (~> 1.12)
@@ -746,7 +745,7 @@ DEPENDENCIES
   rubocop (~> 1.35.1)
   rubocop-performance (~> 1.19.0)
   rubocop-rails (~> 2.20.2)
-  rubocop-rspec (~> 2.4.0)
+  rubocop-rspec (~> 2.17.1)
   rvm1-capistrano3 (~> 1.4.0)
   sassc-rails (~> 2.1.2)
   savon (~> 2.14.0)