Bundle update

.rubocop.yml

@@ -1,3 +1,5 @@
+require: rubocop-performance
+
 AllCops:
   Exclude:
     - db/schema.rb

Gemfile

@@ -101,6 +101,7 @@ group :development do
   gem 'guard-rubocop', require: false
   gem 'haml_lint'
   gem 'rack-livereload'
+  gem 'rubocop-performance'
   # Security checks
   gem 'brakeman', require: false
   gem 'guard-brakeman', require: false

Gemfile.lock

@@ -272,7 +272,7 @@ GEM
       activerecord (>= 4.2, < 6.1)
       request_store (~> 1.1)
     parallel (1.17.0)
-    parser (2.6.2.1)
+    parser (2.6.3.0)
       ast (~> 2.4.0)
     piwik_analytics (1.0.2)
       actionpack
@@ -283,7 +283,6 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    psych (3.1.0)
     public_suffix (3.0.3)
     puma (3.12.1)
     rack (2.0.7)
@@ -347,14 +346,15 @@ GEM
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
       railties (>= 4.2.0, < 6.0)
-    rubocop (0.67.2)
+    rubocop (0.68.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
-      psych (>= 3.1.0)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.6)
+    rubocop-performance (1.1.0)
+      rubocop (>= 0.67.0)
     ruby-progressbar (1.10.0)
     ruby_dep (1.5.0)
     ruby_parser (3.13.1)
@@ -499,6 +499,7 @@ DEPENDENCIES
   rails-assets-leaflet.markercluster!
   rails-controller-testing
   rails-i18n
+  rubocop-performance
   sassc-rails
   sdoc
   simple_calendar