Update jquery-rails gem

Gemfile

@@ -50,7 +50,7 @@ gem 'sprockets'
 gem 'will_paginate'
 gem 'meta-tags', require: 'meta_tags'
 gem 'haml-rails'
-gem 'jquery-rails', '3.1.3'
+gem 'jquery-rails'
 gem 'jquery-migrate-rails'
 gem 'ruby-haml-js'
 gem 'slim'

Gemfile.lock

@@ -254,8 +254,9 @@ GEM
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
     jquery-migrate-rails (1.2.1)
-    jquery-rails (3.1.3)
-      railties (>= 3.0, < 5.0)
+    jquery-rails (4.0.4)
+      rails-dom-testing (~> 1.0)
+      railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (5.0.5)
       railties (>= 3.2.16)
@@ -691,7 +692,7 @@ DEPENDENCIES
   hirb
   jbuilder
   jquery-migrate-rails
-  jquery-rails (= 3.1.3)
+  jquery-rails
   js-routes
   localeapp
   mailcatcher