Workaround extra refnames in git archive

Instead of including all refnames that the tag points to
use only tags to ensure git archive produces a stable
build from a tag regardless of when the archive is created

References:
- python-versioneer/python-versioneer#217

coredis/_version.py

@@ -26,7 +26,7 @@ def get_keywords():
     # setup.py/versioneer.py will grep for the variable names, so they must
     # each be defined on a line of their own. _version.py will just call
     # get_keywords().
-    git_refnames = "$Format:%d$"
+    git_refnames = "$Format:%(describe:exclude=HEAD|main:tags=true)$"
     git_full = "$Format:%H$"
     git_date = "$Format:%ci$"
     keywords = {"refnames": git_refnames, "full": git_full, "date": git_date}