Bump PocketMine-MP version in composer.json to 5.0.0 (#10)

Author: JavierLeon9966

composer.json

@@ -4,7 +4,7 @@
     "type": "library",
     "license": "GPL-3.0",
     "require": {
-        "pocketmine/pocketmine-mp": "^4.0.0"
+        "pocketmine/pocketmine-mp": "^5.0.0"
     },
     "autoload": {
         "classmap": ["src"]