Bug: change expected arg amount to 5

the file name should be considered as 1 arg so
1 + 4 (based on action.yml). the arg amount should be 5

Author: Yanqiao4396

branchwrite.py

@@ -82,9 +82,9 @@ def __write_content(self,content):
 
 def main():
     args = sys.argv
-    expected_arg_amount = 4
+    expected_arg_amount = 5
     if len(args) != expected_arg_amount:
-        raise ValueError(f"4 arguments are expected, {expected_arg_amount - len(args)} from it")
+        raise ValueError(f"5 arguments are expected, {expected_arg_amount - len(args)} from it")
     branch_name = args[1]
     target_path = args[2]
     target_branch = BranchWrite(branch_name, target_path)