fix version

Author: qwj

pproxy/__doc__.py

@@ -11,8 +11,8 @@
     __version__ = get_version()
 except Exception:
     try:
-        from importlib.metadata import version
-        __version__ = version("package-name")
+        from pkg_resources import get_distribution
+        __version__ = get_distribution('pproxy').version
     except Exception:
         __version__ = 'unknown'