Bump version to 4.0.0b4

Author: pnbruckner

custom_components/sun2/manifest.json

@@ -4,9 +4,9 @@
   "codeowners": ["@pnbruckner"],
   "config_flow": true,
   "dependencies": [],
-  "documentation": "https://github.com/pnbruckner/ha-sun2/blob/4.0.0b3/README.md",
+  "documentation": "https://github.com/pnbruckner/ha-sun2/blob/4.0.0b4/README.md",
   "iot_class": "calculated",
   "issue_tracker": "https://github.com/pnbruckner/ha-sun2/issues",
   "requirements": [],
-  "version": "4.0.0b3"
+  "version": "4.0.0b4"
 }