decrease php versions by one

PHP brekas URLs by moving old releases into an archive folder. Since we
cannot be bothered to update these tests everyday, versions have now be
adjusted to be slightly older to always go to the archive download.

appveyor.yml

@@ -8,13 +8,13 @@ version: '{build}.{branch}'
 
 environment:
   matrix:
-    - PHP_VERSION: '7.2.5'
+    - PHP_VERSION: '7.2.4'
       VC: 'VC15'
       PHPUNIT: '7'
-    - PHP_VERSION: '7.0.30'
+    - PHP_VERSION: '7.0.29'
       VC: 'VC14'
       PHPUNIT: '6'
-    - PHP_VERSION: '5.6.36'
+    - PHP_VERSION: '5.6.35'
       VC: 'VC11'
       PHPUNIT: '5'