Merge pull request #11 from mjurin/master

change gsub! with gsub in identity_token private key method

Author: cakejelly

lib/layer/identity_token.rb

@@ -47,7 +47,7 @@ def claim
     def private_key
       # Cloud66 stores newlines as \n instead of \\n
       key = ENV['LAYER_PRIVATE_KEY'].dup
-      OpenSSL::PKey::RSA.new(key.gsub!("\\n","\n"))
+      OpenSSL::PKey::RSA.new(key.gsub("\\n","\n"))
     end
   end
 end