0.20.0:

* wrapped 0.20.0 version of vte.
  API/ABI compatible with 0.16.4, 0.17.1 and 0.19.0. (Krzesimir Nowak)

0.20.1

* most changes backported from 0.19.1. (Krzesimir Nowak)

0.20.2

* added new API (const getter methods) and fixed some memleaks.
  (Krzesimir Nowak)
