Update spring 1.7.2 -> 2.0.1

Gemfile

@@ -296,7 +296,7 @@ group :development, :test do
   gem 'capybara-screenshot', '~> 1.0.0'
   gem 'poltergeist', '~> 1.9.0'
 
-  gem 'spring', '~> 1.7.0'
+  gem 'spring', '~> 2.0.0'
   gem 'spring-commands-rspec', '~> 1.0.4'
   gem 'spring-commands-spinach', '~> 1.1.0'
 

Gemfile.lock

@@ -745,7 +745,8 @@ GEM
       spinach (>= 0.4)
     spinach-rerun-reporter (0.0.2)
       spinach (~> 0.8)
-    spring (1.7.2)
+    spring (2.0.1)
+      activesupport (>= 4.2)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-commands-spinach (1.1.0)
@@ -1001,7 +1002,7 @@ DEPENDENCIES
   slack-notifier (~> 1.5.1)
   spinach-rails (~> 0.2.1)
   spinach-rerun-reporter (~> 0.0.2)
-  spring (~> 1.7.0)
+  spring (~> 2.0.0)
   spring-commands-rspec (~> 1.0.4)
   spring-commands-spinach (~> 1.1.0)
   sprockets (~> 3.7.0)