[deb] update changelog

build-deb.sh

-#!/bin/sh
-gbp buildpackage --git-ignore-new --git-force-create --git-upstream-tree=SLOPPY --git-no-pristine-tar --git-debian-branch=incoming --git-builder='debuild -us -uc'

debian/changelog

+riseup-vpn (0.19.2-1+git) unstable; urgency=medium
+
+  * Bump to 0.19.2
+
+ -- LEAP Encryption Access Project  <debian@leap.se>  Thu, 23 May 2019 16:30:17 +0200
+
 riseup-vpn (0.18.12-3) unstable; urgency=medium
 
   * Initial package.