Bump rubocop-performance from 1.19.0 to 1.19.1

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.19.0 to 1.19.1.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.19.0...v1.19.1)

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

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

Gemfile.lock

@@ -364,7 +364,7 @@ GEM
       rubocop-rails (= 2.20.2)
       rubocop-rake (= 0.6.0)
       rubocop-rspec (= 2.22.0)
-    rubocop-performance (1.19.0)
+    rubocop-performance (1.19.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rails (2.20.2)