upgrade listen to 3.0.4

3.0.3 has a bug in OS X.

Gemfile

@@ -45,7 +45,7 @@ end
 
 # Active Support.
 gem 'dalli', '>= 2.2.1'
-gem 'listen', '~> 3.0.3'
+gem 'listen', '~> 3.0.4'
 
 # Active Job.
 group :job do

Gemfile.lock

@@ -222,7 +222,7 @@ GEM
     kindlerb (0.1.1)
       mustache
       nokogiri
-    listen (3.0.3)
+    listen (3.0.4)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     loofah (2.0.3)
@@ -342,7 +342,7 @@ DEPENDENCIES
   jquery-rails!
   json
   kindlerb (= 0.1.1)
-  listen (~> 3.0.3)
+  listen (~> 3.0.4)
   mail!
   minitest (< 5.3.4)
   mocha (~> 0.14)

guides/source/configuring.md

@@ -1159,7 +1159,7 @@ false:
 
 ```ruby
 group :development do
-  gem 'listen'
+  gem 'listen', '~> 3.0.4'
 end
 ```
 

railties/lib/rails/generators/rails/app/templates/Gemfile

@@ -51,7 +51,7 @@ group :development do
 
   # Loading the listen gem enables an evented file system monitor. Check
   # https://github.com/guard/listen#listen-adapters if on Windows or *BSD.
-  # gem 'listen', '~> 3.0.3'
+  # gem 'listen', '~> 3.0.4'
 end
 <% end  -%>