Fix appveyor build

Author: paceholder

.appveyor.yml

@@ -5,7 +5,7 @@ environment:
     - GENERATOR : "Visual Studio 16 2019"
       ARCHITECTURE : "-A x64"
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      QTDIR: C:\Qt\5.15.1\msvc2019_64
+      QTDIR: C:\Qt\5.15.2\msvc2019_64
       PLATFORM: x64
     - GENERATOR : "Visual Studio 15 2017"
       ARCHITECTURE : ""