This is a minor bug-fix release containing a number of fixes:
- Fix min/max functions with generators, and 'None' default (PR #514)
- Use BaseException in raise_() (PR #515)
- Fix builtins.round() for Decimals (Issue #501)
- Fix raise_from() to prevent failures with immutable classes (PR #518)
- Make FixInput idempotent (Issue #427)
- Fix type in newround (PR #521)
- Support mimetype guessing in urllib2 for Py3.8+ (Issue #508)
Python 3.8 is not yet officially supported.