Remove check for method name without "dot" separator

There are valid methods like "methods" and "scope" that do not have a "dot" separator within their name.
According to the documentation and a "methods" call, there are 5 such methods: ['batch', 'scope', 'methods', 'events', 'profile']

Author: vk-fin

bitrix24/bitrix24.py

@@ -150,7 +150,7 @@ def callMethod(self, method: str, params: Dict[str, Any] = {}, **kwargs) -> Dict
         -------
             Returning the REST method response as an array, an object or a scalar
         """
-        if not method or len(method.split(".")) < 2:
+        if not method:
             raise BitrixError("Wrong method name", 400)
 
         try: