Clean up gemspec file

graphql-cache.gemspec

@@ -1,31 +1,32 @@
+# frozen_string_literal: true
 
-lib = File.expand_path("../lib", __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "graphql/cache/version"
+require 'graphql/cache/version'
 
 Gem::Specification.new do |s|
-  s.name          = "graphql-cache"
+  s.name          = 'graphql-cache'
   s.version       = GraphQL::Cache::VERSION
-  s.authors       = ["Michael Kelly"]
-  s.email         = ["michaelkelly322@gmail.com"]
+  s.authors       = ['Michael Kelly']
+  s.email         = ['michaelkelly322@gmail.com']
 
-  s.summary       = %q{Caching middleware for graphql-ruby}
-  s.description   = %q{Provides middleware field-level caching for graphql-ruby}
-  s.homepage      = "https://github.com/Leanstack/graphql-cache"
-  s.license       = "MIT"
+  s.summary       = 'Caching middleware for graphql-ruby'
+  s.description   = 'Provides middleware field-level caching for graphql-ruby'
+  s.homepage      = 'https://github.com/Leanstack/graphql-cache'
+  s.license       = 'MIT'
 
   s.files         = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
-  s.require_paths = ["lib"]
-  s.required_ruby_version = ">= 2.2.0" # bc graphql-ruby requires >= 2.2.0
+  s.require_paths = ['lib']
+  s.required_ruby_version = '>= 2.2.0' # bc graphql-ruby requires >= 2.2.0
 
-  s.add_development_dependency "bundler", "~> 1.16"
-  s.add_development_dependency "rake", "~> 10.0"
-  s.add_development_dependency "rspec", "~> 3.0"
-  s.add_development_dependency "simplecov"
-  s.add_development_dependency "codeclimate-test-reporter"
-  s.add_development_dependency "pry"
+  s.add_development_dependency 'bundler', '~> 1.16'
+  s.add_development_dependency 'codeclimate-test-reporter'
+  s.add_development_dependency 'pry'
+  s.add_development_dependency 'rake',    '~> 10.0'
+  s.add_development_dependency 'rspec',   '~> 3.0'
+  s.add_development_dependency 'simplecov'
 
   s.add_dependency 'graphql', '~> 1.8.0.pre10'
 end