Update spring to 1.3.3

Gemfile

@@ -250,7 +250,7 @@ group :development, :test do
 
   gem 'jasmine', '2.0.2'
 
-  gem "spring", '1.3.1'
+  gem "spring", '~> 1.3.1'
   gem "spring-commands-rspec", '1.0.4'
   gem "spring-commands-spinach", '1.0.0'
 end

Gemfile.lock

@@ -570,7 +570,7 @@ GEM
       capybara (>= 2.0.0)
       railties (>= 3)
       spinach (>= 0.4)
-    spring (1.3.1)
+    spring (1.3.3)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-commands-spinach (1.0.0)
@@ -773,7 +773,7 @@ DEPENDENCIES
   slack-notifier (~> 1.0.0)
   slim
   spinach-rails
-  spring (= 1.3.1)
+  spring (~> 1.3.1)
   spring-commands-rspec (= 1.0.4)
   spring-commands-spinach (= 1.0.0)
   stamp