Bump rubocop-performance from 1.14.3 to 1.15.0 in /dependencies

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.14.3 to 1.15.0.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.14.3...v1.15.0)

---
updated-dependencies:
- dependency-name: rubocop-performance
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

dependencies/Gemfile

@@ -7,7 +7,7 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 gem "rubocop", "~> 1.35.0"
 gem "rubocop-github", "~> 0.18.0"
 gem "rubocop-minitest", "~> 0.21.0"
-gem "rubocop-performance", "~>1.14.3"
+gem "rubocop-performance", "~>1.15.0"
 gem "rubocop-rails", "~> 2.15"
 gem "rubocop-rake", "~> 0.6.0"
 gem "rubocop-rspec", "~> 2.12.1"

dependencies/Gemfile.lock

@@ -37,7 +37,7 @@ GEM
       rubocop-rails
     rubocop-minitest (0.21.0)
       rubocop (>= 0.90, < 2.0)
-    rubocop-performance (1.14.3)
+    rubocop-performance (1.15.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rails (2.15.2)
@@ -51,7 +51,7 @@ GEM
     ruby-progressbar (1.11.0)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.2.0)
+    unicode-display_width (2.3.0)
 
 PLATFORMS
   ruby
@@ -60,7 +60,7 @@ DEPENDENCIES
   rubocop (~> 1.35.0)
   rubocop-github (~> 0.18.0)
   rubocop-minitest (~> 0.21.0)
-  rubocop-performance (~> 1.14.3)
+  rubocop-performance (~> 1.15.0)
   rubocop-rails (~> 2.15)
   rubocop-rake (~> 0.6.0)
   rubocop-rspec (~> 2.12.1)