News
* This will be the last release supporting Python 2.7, 3.5, and the PyCrypto
backend.
Bug fixes and Improvements
* Use hmac.compare_digest instead of our own constant_time_string_compare 163
* Fix `to_dict` output, which should always be JSON encodeable. 139 and 165
(fixes 127 and 137)
* Require setuptools >= 39.2.0 167 (fixes 161)
* Emit a warning when verifying with a private key 168 (fixes 53 and 142)
* Avoid loading python-ecdsa when using the cryptography backend, and pinned
python-ecdsa dependency to <0.15 178
Housekeeping
* Fixed some typos 160, 162, and 164