Update debian/changelog for v0.2.1 release #nodch

While at it, minor change in git-dch.sh to extract package name
from Source: rather than Package: line(s) in control file
(we're multi-package now).

debian/changelog

@@ -1,3 +1,9 @@
+argon1 (0.2.1) unstable; urgency=low
+
+  * Fix case button press handling
+
+ -- Spiros Papadimitriou <spapadim@gmail.com>  Thu, 9 Jul 2020 13:48:30 -0400
+
 argon1 (0.2) unstable; urgency=low
 
   * Make lxplugin icon change color based on fan speed

git-dch.sh

@@ -41,7 +41,7 @@ check_version_tag() {
 [ -d debian ] || die "ERROR: debian folder does not exist; is pwd wrong?"
 
 [ -f debian/control ] || die "ERROR: debian/control does not exist"
-pkgname=`cat debian/control | grep '^Package: ' | sed 's/^Package: //'`
+pkgname=`cat debian/control | grep '^Source: ' | sed 's/^Source: //'`
 
 replace_changelog=0
 keep_last=""