chore(branchlint): update config

Author: ThornWalli

Diff for: .branchlintrc

@@ -23,6 +23,7 @@
     "disallowed": [
       "main",
       "master",
+      "beta",
       "develop",
       "staging"
     ],
@@ -33,4 +34,4 @@
     "msgPrefixSuggestion": "Instead of \"%s\" try \"%s\".",
     "msgSeperatorRequired": "Branch \"%s\" must contain a seperator \"%s\"."
   }
-}
+}