Bump debhelper compat to 12, no changes needed.

debian/changelog

@@ -2,6 +2,7 @@ lxqt-build-tools (0.6.0-0ubuntu1) UNRELEASED; urgency=medium
 
   * New upstream release.
   * Bump Standards-version to 4.3.0, no changes needed.
+  * Bump debhelper compat to 12, no changes needed.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Fri, 25 Jan 2019 21:57:11 -0600
 

debian/compat

@@ -1 +1 @@
-11
+12

debian/control

@@ -5,7 +5,7 @@ Uploaders: Alf Gaida <agaida@siduction.org>,
            ChangZhuo Chen (陳昌倬) <czchen@debian.org>
 Section: devel
 Priority: optional
-Build-Depends: debhelper (>= 11),
+Build-Depends: debhelper (>= 12),
                cmake,
                libglib2.0-dev,
                pkg-config,