Add git commit hash to version when not building wheel

Author: pkch

setup.py

@@ -14,12 +14,15 @@
 # alternative forms of installing, as suggested by README.md).
 from setuptools import setup
 from setuptools.command.build_py import build_py
-from mypy.version import base_version
+from mypy.version import base_version, __version__
 from mypy import git
 
 git.verify_git_integrity_or_abort(".")
 
-version = base_version
+if 'bdist_wheel' in sys.argv[1:]:
+    version = base_version
+else:
+    version = __version__
 description = 'Optional static typing for Python'
 long_description = '''
 Mypy -- Optional Static Typing for Python