fix error

announcement.gemspec

@@ -163,7 +163,7 @@ if bundle_update_flag
       r = open("#{env_pwd}/config/environment.rb",'r'){|f| f.read()}
       secret_key = r.scan(/Orbit::Application\.config\.secret_key_base = '(.*)'/).flatten[0] rescue nil
       if !secret_key.nil?
-         open("#{env_pwd}/config/secrets.yml",'r+') do |f|
+         open("#{env_pwd}/config/secrets.yml",'w+') do |f|
           c = {"production"=> {"secret_key_base"=> secret_key},"development"=> {"secret_key_base"=> secret_key}}.to_yaml.sub("---\n",'')
           f.write(c)
         end