appium_lib.gemspec in appium_lib-2.0.0 vs appium_lib.gemspec in appium_lib-2.1.0

@@ -24,12 +24,12 @@
 
   s.add_runtime_dependency 'selenium-webdriver', '~> 2.41', '>= 2.41.0'
   s.add_runtime_dependency 'awesome_print', '~> 1.2', '>= 1.2.0'
   s.add_runtime_dependency 'json', '~> 1.8', '>= 1.8.1'
   s.add_runtime_dependency 'toml', '~> 0.0', '>= 0.0.4'
-  s.add_runtime_dependency 'posix-spawn', '~> 0.3', '>= 0.3.8'
   s.add_runtime_dependency 'nokogiri', '~> 1.6.1'
 
+  s.add_development_dependency 'posix-spawn', '~> 0.3', '>= 0.3.8'
   s.add_development_dependency 'hashdiff', '~> 0.2.0'
   s.add_development_dependency 'spec', '~> 5.3.4'
   s.add_development_dependency 'fakefs', '~> 0.5.0'
 
   s.add_development_dependency 'rake', '~> 10.2', '>= 10.2.2'
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