Update LXQt build dependencies.

debian/changelog

@@ -2,6 +2,7 @@ qtermwidget (0.15.0-0ubuntu1) UNRELEASED; urgency=medium
 
   * New upstream release.
     - Update upstream signing key.
+    - Update LXQt build dependencies.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Fri, 01 May 2020 00:06:42 -0500
 

debian/control

@@ -8,7 +8,7 @@ Priority: optional
 Build-Depends: debhelper-compat (= 12),
                cmake,
                libutf8proc-dev,
-               lxqt-build-tools (>= 0.6.0~),
+               lxqt-build-tools (>= 0.7.0),
                qtbase5-dev
 Standards-Version: 4.5.0
 Vcs-Browser: https://salsa.debian.org/lxqt-team/qtermwidget