Removed celluloid, added concurrent-ruby and rubocop

.rubocop.yml

@@ -0,0 +1,17 @@
+require: rubocop-rspec
+
+AllCops:
+  Include:
+    - ./Gemfile
+
+Documentation:
+  Enabled: false
+
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/ClassAndModuleChildren:
+  EnforcedStyle: compact
+
+RSpec/FilePath:
+  Enabled: false

sidekiq-grouping.gemspec

@@ -1,14 +1,15 @@
-# coding: utf-8
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'sidekiq/grouping/version'
+require "sidekiq/grouping/version"
 
 Gem::Specification.new do |spec|
   spec.name          = "sidekiq-grouping"
   spec.version       = Sidekiq::Grouping::VERSION
   spec.authors       = ["Victor Sokolov"]
   spec.email         = ["gzigzigzeo@gmail.com"]
-  spec.summary       = %q{Allows identical sidekiq jobs to be processed with a single background call}
+  spec.summary       = %q(
+    Allows identical sidekiq jobs to be processed with a single background call
+  )
   spec.homepage      = "http://github.com/gzigzigzeo/sidekiq-grouping"
   spec.license       = "MIT"
 
@@ -26,5 +27,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "timecop"
 
   spec.add_dependency "sidekiq"
-  spec.add_dependency "celluloid"
+  spec.add_dependency "concurrent-ruby"
 end