Bump version to 2.0.0

Author: jesserockz

library.json

@@ -10,7 +10,7 @@
     "type": "git",
     "url": "https://github.com/esphome/AsyncTCP.git"
   },
-  "version": "1.2.2",
+  "version": "2.0.0",
   "license": "LGPL-3.0",
   "frameworks": "arduino",
   "platforms": ["espressif32", "libretuya"],