ChangeLog: set date for v3.0.0

v2.0.0

New features:
  * support for Python 3.x
  * run sql statements from a file
  * print command aliases
  * cmd uacreg: management of uacreg records
  * cmd srv: server info
  * cmd rtpengine: management of rtpengine module
  * cmd tcp: management of tcp connections

version 1.1.0