Update .appveyor.yml

Author: aminyazdanpanah

.appveyor.yml

@@ -19,9 +19,7 @@ environment:
   ffmpeg_download: https://ffmpeg.zeranoe.com/builds/win64/static/ffmpeg-20190725-923d5c4-win64-static.zip
 
   matrix:
-    - PHP_VERSION: 7.1
-
-    - PHP_VERSION: 7.2
+    - PHP_VERSION: Latest_Version
 
 init:
   - ps: $env:PATH = 'c:\tools\php;c:\ProgramData\ComposerSetup\bin;' + $env:PATH