python-serpent-1.28-bp152.2.1

- version update to 1.28
  * the souce dist archive now contains the unit tests as well
- run the testsuite

- Update to 1.27:
  * fixed serialization of unicode elements in dicts and sets (this was a regression on Python 2.x)
  * support for enum34 backport library for enums in older python versions.
  * Some small tweaks and attempt to fix an inconsistently running unit test
  * LICENSE file included in release.

- Remove superfluous devel dependency for noarch package

- Update to 1.24
  * fix Python 3.7 deprecation warnings about
    importing ABC types from collections vs collections.abc
- spec file cleanups

- Initial version