Use key? method rather than keys.include? (#427)
Use key? method rather than keys.include? (#427)

Ruby offers a `key?` method to check if a key exist in a Hash so we
don't need to create a list of keys from the Hash and check the values
in the Array ourselves.
appsignal/appsignal-ruby,matrinox/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal,matrinox/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal