Returning HTTP response code 200 for bad requests

Hi!

I've noticed you return 200 status codes when the request is missing required parameters, maybe this should be changed to 400 to signal a bad request?

Example:
https://www.omdbapi.com/?apikey=xxx&foo=bar
Response:
[200] {"Response":"False","Error":"Something went wrong."}

Expected Response:
[400] {"Response":"False","Error":"Missing required field."}