Require at least requests v2.14.2 to update old chardet

[timvisee]

docker-py is having trouble with requests<2.14 because it may use an old version of chardet. Some new function is used that does not exist in older versions of the dependency, causing it to crash in some cases.

When using docker-py with Ansible, using modules like docker_network result in an error with old versions of chardet installed. These errors are resolved when using chardet>=3.0. requests now requires this version since 2.14.

This problem would only happen if an earlier version of requests was already installed by some other package, where the version was still satisfied by the current docker-py configuration and was below 2.14. When the dependency is freshly installed, this problem would not occur as a version higher than 2.14 would be chosen.

It could be manually fixed by installing chardet>=3.0.1 in the command line using pip, but this is of course not desired.

Therefore I've changed the configuration to require at least requests>=2.14.2 (where the patch version .2 fixed some bugs) to fix this issue as a whole.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "chardet-fix" git@github.com:timvisee/docker-py.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[timvisee]

I've signed the commit now. The PR has been updated.

[shin-]

Thanks!

Putting a pin in this, because it'll conflict with the docker-compose requirements, but we should be able to reconcile.

[timvisee]

Thank you for looking into it.

Hmm, maybe a temporary fix could be to require the proper chardet version explicitly in docker-py. Although, I don't think such a thing is recommended.

[shin-]

Should be good now. Thank you!