Update required php version to 7.2

Author: socheatsok78

composer.json

@@ -20,7 +20,7 @@
     "repository-pattern"
   ],
   "require": {
-    "php": ">=7.0",
+    "php": ">=7.2",
     "illuminate/console": "~5.3.0|~5.4.0|~5.5.0|~5.6.0|~5.7.0|~5.8.0",
     "illuminate/contracts": "~5.3.0|~5.4.0|~5.5.0|~5.6.0|~5.7.0|~5.8.0",
     "illuminate/support": "~5.3.0|~5.4.0|~5.5.0|~5.6.0|~5.7.0|~5.8.0"