2.18.1:
Bugfixes
* Fix an error in the packaging whereby the *.whl contained incorrect data that regressed the fix in v2.17.3.

2.18.0:
Improvements
* Response is now a context manager, so can be used directly in a with statement without first having to be wrapped by contextlib.closing().
Bugfixes
* Resolve installation failure if multiprocessing is not available
* Resolve tests crash if multiprocessing is not able to determine the number of CPU cores
* Resolve error swallowing in utils set_environ generator

(adam)