release: v0.2.1

CHANGELOG:
- meta: improve efficiency of cross-platform interfaces on Solaris
- refactor: remove getpeereid()
- refactor(xucred): always define Xucred.pid
- fix(ffi): remove None check when loading libc (should fix on musl
  libc)
- fix(ucred): use correct socket level on NetBSD
- meta: fix packaging issues
- doc: improved documentation
- test: improved tests

unix_cred/__init__.py

@@ -2,7 +2,7 @@
 import sys
 from typing import Optional, Tuple, Union
 
-__version__ = "0.2.0"
+__version__ = "0.2.1"
 
 __all__ = ["get_peer_uid_gid"]