Log Message:
Updated py-setuptools_scm to 1.13.0.

v1.13.0
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* fix regression caused by the fix of #101
  * assert types for version dumping
  * strictly pass all versions trough parsed version metadata

v1.12.0
=======

* fix issue #97 - add support for mercurial plugins
* fix issue #101 - write version cache even for pretend version
  (thanks anarcat for reporting and fixing)