Switch to quilt, fix version to add debian version.

debian/changelog

-kcm-about-extended (0.git~20171103.f85e06c) unstable; urgency=medium
+kcm-about-extended (0.git~20171103.f85e06c-1) stable; urgency=medium
 
   * Initial release (Closes: #nnnn)  <nnnn is the bug number of your ITP>
 

debian/control

 Source: kcm-about-extended
-Section: unknown
+Section: kde
 Priority: optional
 Maintainer: Rohan Garg <rohan@kde.org>
 Build-Depends: cmake,

debian/source/format

-3.0 (native)
+3.0 (quilt)