Daniel Kahn Gillmor authored Feb 23, 2018 and Daniel Salzman committed Feb 28, 2018

This fixes a simple spelling mistake.

Changing the name of an optional parameter is potentially dicey, but
in python3, int.to_bytes calls this parameter "byteorder" so i doubt
that anyone is using the misspelled "endianess" anywhere outside of
pykeymgr anyway.