Update manifest.json

Bump to version 0.3.0

Author: lbbrhzn

custom_components/ocpp/manifest.json

@@ -4,7 +4,7 @@
   "documentation": "https://github.com/lbbrhzn/ocpp/blob/main/README.md",
   "iot_class": "local_push",
   "issue_tracker": "https://github.com/lbbrhzn/ocpp/issues",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "config_flow": true,
   "codeowners": [
     "@lbbrhzn"
@@ -13,4 +13,4 @@
     "ocpp>=0.8",
     "websockets>=8.0"
   ]
-}
+}