We can get the version from git for pip installs. Fixes #3

Maybe we should tag from setup.py instead

CHANGES

@@ -1,3 +1,6 @@
+Version 0.8.2:
+- fix #3 (we cannot get the revision from git for pip installs)
+
 Version 0.8.1:
 - document changes (this file)
 

setup.py

@@ -4,17 +4,11 @@
 It is fairly complete for PCM devices and Mixer access.
 '''
 
-import subprocess
 from distutils.core import setup
 from distutils.extension import Extension
 from sys import version
 
-def gitrev():
-    rev = subprocess.check_output(['git', 'describe', '--tags', '--dirty=-dev',
-                                  '--always'])
-    return rev.decode('utf-8').strip()
-
-pyalsa_version = gitrev()
+pyalsa_version = '0.8.2'
 
 # patch distutils if it's too old to cope with the "classifiers" or
 # "download_url" keywords