Update LXQt build dependencies.

debian/changelog

@@ -2,6 +2,7 @@ lximage-qt (0.15.0-0ubuntu1) UNRELEASED; urgency=medium
 
   * New upstream release.
     - Update upstream signing key.
+    - Update LXQt build dependencies.
   * Update Standards-version to 4.5.0, no changes needed.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Tue, 28 Apr 2020 18:05:41 -0500

debian/control

@@ -6,13 +6,13 @@ Section: x11
 Priority: optional
 Build-Depends: debhelper-compat (= 12),
                libexif-dev,
-               libfm-qt-dev (>= 0.14.1~),
+               libfm-qt-dev (>= 0.15.0),
                libkf5windowsystem-dev,
                libqt5svg5-dev,
                libqt5x11extras5-dev,
                libx11-dev,
                libxfixes-dev,
-               lxqt-build-tools (>= 0.6.0~)
+               lxqt-build-tools (>= 0.7.0)
 Standards-Version: 4.5.0
 Vcs-Browser: https://phab.lubuntu.me/source/lxqt-panel/
 Vcs-Git: https://phab.lubuntu.me/source/lxqt-panel.git