Updated php constraint to be more reliable over the years

Author: Geolim4

composer.json

@@ -21,7 +21,7 @@
             }
         ],
     "require": {
-        "php": "^7.0 || ^7.1 || ^7.2",
+        "php": ">=7.0",
         "psr/cache": "~1.0.0",
         "psr/simple-cache": "~1.0.0",
         "ext-mbstring": "*",