remove unused __version__ from mock.py (python#17977)

cjw296 · web-flow · commit 31d6de5aba00 · 2020-01-13T19:11:34.000Z
This isn't included in `__all__` and could be a source of confusion.
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
@@ -23,8 +23,6 @@
 )
 
 
-__version__ = '1.0'
-
 import asyncio
 import contextlib
 import io
