Update build dependencies.

debian/changelog

@@ -2,6 +2,7 @@ lxqt-openssh-askpass (0.13.0-0ubuntu1) UNRELEASED; urgency=medium
 
   * New upstream release.
   * Update Vcs-* and Maintainer to Lubuntu values.
+  * Update build dependencies.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Tue, 22 May 2018 21:43:22 -0500
 

debian/control

@@ -8,9 +8,9 @@ Uploaders: Alf Gaida <agaida@siduction.org>,
            Yuan CHAO <yuanchao@gmail.com>
 Section: x11
 Priority: optional
-Build-Depends: debhelper (>= 11~),
+Build-Depends: debhelper (>= 11),
                libkf5windowsystem-dev,
-               liblxqt0-dev (>= 0.12.0),
+               liblxqt0-dev (>= 0.13.0),
                libqt5svg5-dev,
                libqt5x11extras5-dev,
                libx11-dev