remove requests requirements

[pahaz]

No description provided.

[MartinThoma]

@pahaz Please be more specific. Is this a feature request? A bug report? What happened / what did you expect to happen? What do you want to do?

[pahaz]

@MartinThoma sorry, I try to explain you.

As you can see here https://github.com/schickling/docker-hook#features one of the feature of this project is "No dependencies". But now, this project have "requests" dependence.

[MartinThoma]

@pahaz Thank you for explaining it.
urllib and urllib2 are in the standard library.

u = urllib2.urlopen(json_params['callback_url'], json.dumps(data))
h.request('POST', '/whatever/index.php', data, headers)

could be what we need.