Use ruby 2.x hash syntax

spec/support/user_integration_helpers.rb

@@ -2,17 +2,17 @@ module UserIntegrationHelpers
   def sign_in
     user = FactoryGirl.create(:user)
     visit new_session_path
-    fill_in 'Email', :with => user.email
-    fill_in 'Password', :with => user.password
+    fill_in 'Email', with: user.email
+    fill_in 'Password', with: user.password
     click_button('Sign in')
   end
 
   def api_sign_in
     user = FactoryGirl.create :user
 
-    post api_sessions_path, :format => :json, :session => {
-      :email    => user.email,
-      :password => user.password
+    post api_sessions_path, format: :json, session: {
+      email:    user.email,
+      password: user.password
     }
   end
 end