dont expose secret key for recaptcha

Author: dsjoerg

config/initializers/recaptcha.rb

@@ -1,4 +1,4 @@
 Recaptcha.configure do |config|
-  config.public_key  = '6Lcg3SkUAAAAAO4yYqDriPdh-er7islVavz1m-X2'
-  config.private_key = '6Lcg3SkUAAAAAEKwJT0Xy-U8XRC8_Qhc1w6FlZRv'
+  config.public_key  = '6Lc35yoUAAAAACUODLMbUxj4pC7NfUt5s-i76Z7D'
+  config.private_key = Rails.application.secret('recaptcha_secret')
 end