docs/wrspice_release_notes

wrs3.2 120968Sun Jan 18 21:24:29 PST 2015
wrs4.1 71094Wed Sep 30 20:38:09 PDT 2015
wrs4.2 48681Tue Mar 28 22:15:05 PDT 2017
wrs4.3 20959Wed Apr 11 17:59:25 PDT 2018