asset.gemspec in asset-0.1.8 vs asset.gemspec in asset-0.1.9

@@ -1,8 +1,8 @@
 Gem::Specification.new do |s|
   s.name        = 'asset'
-  s.version     = '0.1.8'
+  s.version     = '0.1.9'
   s.date        = '2017-01-19'
   s.summary     = "Compress and serve your CSS and JS assets automatically"
   s.description = "The only thing you need for your assets."
   s.authors     = ["Fugroup Limited"]
   s.email       = '[e-mail]'
@@ -18,9 +18,10 @@
   s.add_development_dependency 'erubis', '>= 0'
   s.add_development_dependency 'rest-client', '>= 0'
   s.add_development_dependency 'request_store', '>= 0'
   s.add_development_dependency 'fuprint', '>= 0'
   s.add_development_dependency 'futest', '>= 0'
+  s.add_development_dependency 'listen', '>= 0'
 
   s.homepage    = 'https://github.com/fugroup/asset'
   s.license     = 'MIT'
 
   s.require_paths = ['lib']