CHANGES: add note about new geography/laszip

This is the description that was missing from the actual commit:

LASzip - a free product of rapidlasso GmbH - quickly turns bulky LAS
files into compact LAZ files without information loss. Terabytes of LAZ
data are now available for free download from various agencies making
LASzip, winner of the 2012 Geospatial World Forum Technology Innovation
Award in LiDAR Processing and 2nd place winner for innovative product
at INTERGEO 2012, the de-facto standard for LiDAR compression.

(thor)