Update version to 1.6.4

Author: AlexxIT

custom_components/xiaomi_gateway3/manifest.json

@@ -7,6 +7,6 @@
   "codeowners": ["@AlexxIT"],
   "dependencies": ["http"],
   "requirements": [],
-  "version": "1.6.3",
+  "version": "1.6.4",
   "iot_class": "local_push"
 }