tell rubocop that we want to use the new hash syntax, update missing ones

Author: siegy22

.rubocop.yml

@@ -14,7 +14,7 @@ Style/FileName:
     - 'lib/dotenv-rails.rb'
 
 Style/HashSyntax:
-  EnforcedStyle: 'hash_rockets'
+  EnforcedStyle: 'ruby19'
 
 Style/StringLiterals:
   EnforcedStyle: 'double_quotes'

Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
-gemspec :name => "dotenv"
-gemspec :name => "dotenv-rails"
+gemspec name: "dotenv"
+gemspec name: "dotenv-rails"
 
 group :guard do
   gem "guard-rspec"

Guardfile

@@ -2,7 +2,7 @@ guard "bundler" do
   watch("Gemfile")
 end
 
-guard "rspec", :cmd => "bundle exec rspec" do
+guard "rspec", cmd: "bundle exec rspec" do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^spec/spec_helper.rb$}) { "spec" }
   watch(%r{^lib/(.+)\.rb$})        { |m| "spec/#{m[1]}_spec.rb" }

Rakefile

@@ -3,7 +3,7 @@
 require "bundler/gem_helper"
 
 namespace "dotenv" do
-  Bundler::GemHelper.install_tasks :name => "dotenv"
+  Bundler::GemHelper.install_tasks name: "dotenv"
 end
 
 namespace "dotenv-rails" do
@@ -13,12 +13,12 @@ namespace "dotenv-rails" do
     def tag_version; end # noop
   end
 
-  DotenvRailsGemHelper.install_tasks :name => "dotenv-rails"
+  DotenvRailsGemHelper.install_tasks name: "dotenv-rails"
 end
 
-task :build => ["dotenv:build", "dotenv-rails:build"]
-task :install => ["dotenv:install", "dotenv-rails:install"]
-task :release => ["dotenv:release", "dotenv-rails:release"]
+task build: ["dotenv:build", "dotenv-rails:build"]
+task install: ["dotenv:install", "dotenv-rails:install"]
+task release: ["dotenv:release", "dotenv-rails:release"]
 
 require "rspec/core/rake_task"
 
@@ -31,4 +31,4 @@ end
 require "rubocop/rake_task"
 RuboCop::RakeTask.new
 
-task :default => [:spec, :rubocop]
+task default: [:spec, :rubocop]