Update LXQt build dependencies.

debian/changelog

@@ -7,6 +7,7 @@ lxqt-qtplugin (0.15.0-0ubuntu1) UNRELEASED; urgency=medium
 
   [ Simon Quigley ]
   * New upstream version.
+    - Update LXQt build dependencies.
   * Bump Standards-version to 4.5.0, no changes needed.
 
  -- apt-ghetto <apt-ghetto@protonmail.com>  Thu, 09 May 2019 18:27:21 +0200

debian/control

@@ -6,14 +6,14 @@ Section: x11
 Priority: optional
 Build-Depends: debhelper-compat (= 12),
                libdbusmenu-qt5-dev,
-               libfm-qt-dev (>= 0.14.1),
+               libfm-qt-dev (>= 0.15.0),
                libkf5windowsystem-dev,
                libqt5svg5-dev,
                libqt5xdg-dev,
                libqt5x11extras5-dev,
-               libqt5xdgiconloader-dev (>= 3.3.1),
+               libqt5xdgiconloader-dev (>= 3.5.0),
                libx11-dev,
-               lxqt-build-tools (>= 0.6.0),
+               lxqt-build-tools (>= 0.7.0),
                qtbase5-private-dev
 Standards-Version: 4.5.0
 Vcs-Browser: https://phab.lubuntu.me/source/lxqt-qtplugin/