Merge pull request #348 from BQSKit/v1.2.1

Bump version to 1.2.1

Author: edyounis

bqskit/_version.py

@@ -1,4 +1,4 @@
 """This module contains the version information for BQSKit."""
 from __future__ import annotations
-__version_info__ = ('1', '2', '0')
+__version_info__ = ('1', '2', '1')
 __version__ = '.'.join(__version_info__[:3]) + ''.join(__version_info__[3:])