Merge pull request #3717 from mauri870/5.1

[5.1] Fix clear-compiled error during composer installation

composer.json

@@ -32,10 +32,8 @@
             "php artisan clear-compiled",
             "php artisan optimize"
         ],
-        "pre-update-cmd": [
-            "php artisan clear-compiled"
-        ],
         "post-update-cmd": [
+            "php artisan clear-compiled",
             "php artisan optimize"
         ],
         "post-root-package-install": [