Move upgrade directions for version < 1.5.0 to history document The upgrading doc is huge. Most people don't need docs more than 10 years old. Move docs for versions less than 1.5.0 (July 2013) to upgrading-history.txt. Probably could cut this back to 5 years (1.6.0 release in 2018) but lets go with 10 for now.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))