Generate check object for all response codes (not 200 only) #13

Currently, when a response code is different than 200, the workflow generated will not contain check object, therefore the runner will not checking nor response code neither body.

I saw a specific condition for 200 in the code.

index.js line 167
if (swagger.paths[path][method].responses && swagger.paths[path][method].responses['200']) {

I wonder the reason of this and if there is something else I am missing.

We are interested on contribute, so we could develop to handle multiple response codes. Any suggestion is welcome, of course.