Bump build dependencies.

debian/changelog

@@ -1,6 +1,7 @@
 lxqt-config (0.14.0-0ubuntu1) UNRELEASED; urgency=medium
 
   * New upstream release.
+    - Bump build dependencies.
   * Bump debhelper compat to 12, no changes needed.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Sat, 26 Jan 2019 00:01:01 -0600

debian/control

@@ -7,7 +7,7 @@ Priority: optional
 Build-Depends: debhelper (>= 12),
                libkf5screen-dev,
                libkf5windowsystem-dev,
-               liblxqt0-dev (>= 0.13.0),
+               liblxqt0-dev (>= 0.14.0),
                libqt5svg5-dev,
                libqt5x11extras5-dev,
                libx11-dev,