update composer.json; bump laravel version support

Author: yiedpozi

composer.json

@@ -18,7 +18,7 @@
     "homepage": "https://github.com/php-telegram-bot/laravel",
     "keywords": ["laravel", "telegram", "bot"],
     "require": {
-        "illuminate/support": "~7|~8|~9|~10",
+        "illuminate/support": "~7|~8|~9|~10|~11|~12",
         "longman/telegram-bot": "^0.81",
         "ext-pcntl": "*"
     },