Properly initialize version string in python-hglib setup.py

[Peter Elmers]

# HG changeset patch
# User Peter Elmers <peter.elmers at yahoo.com>
# Date 1432680605 25200
#Â Â Â Â Â  Tue May 26 15:50:05 2015 -0700
# Node ID 9afa1d6c9da357b3f61f7e4eb4b08390c4bc5fd1
# Parent  ec935041d1ff0fd2aa8cb666d79e6dcca398ddba
version: declare a default version in setup.py (issue3924)

Leaving version as "unknown" breaks `pip freeze`, so we should default the
version to the current version and let it update itself if a more precise one
can be pulled from version control.

diff -r ec935041d1ff -r 9afa1d6c9da3 setup.py
--- a/setup.py    Wed Apr 01 13:34:58 2015 -0500
+++ b/setup.py    Tue May 26 15:50:05 2015 -0700
@@ -2,7 +2,7 @@
 from distutils.core import setup
 
 # query Mercurial for version number
-version = 'unknown'
+version = '1.6'
 if os.path.isdir('.hg'):
     cmd = "hg id -i -t"
     l = os.popen(cmd).read().split()

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