versioneer 0.20 regression fixed

Versioneer 0.20 added escape character to the match option of git
describe

```
(base) C:\Users\opavlyk\devel\dpctl>git describe --tags --dirty --always --long --match "\*"
3bd37749

(base) C:\Users\opavlyk\devel\dpctl>git describe --tags --dirty --always --long --match "\\*"
3bd37749

(base) C:\Users\opavlyk\devel\dpctl>git describe --tags --dirty --always --long --match "*"
0.12.0dev3-33-g3bd37749
```

Author: oleksandr-pavlyk

versioneer.py

@@ -1165,7 +1165,7 @@ def git_pieces_from_vcs(tag_prefix, root, verbose, runner=run_command):
     TAG_PREFIX_REGEX = "*"
     if sys.platform == "win32":
         GITS = ["git.cmd", "git.exe"]
-        TAG_PREFIX_REGEX = r"\*"
+        TAG_PREFIX_REGEX = r"*"  # r"\*"  - using escape on windows breaks tag extraction
 
     _, rc = runner(GITS, ["rev-parse", "--git-dir"], cwd=root,
                    hide_stderr=True)