Add warning about sensitive values before creating bucket

Author: RealOrangeOne

buckup/command_line.py

@@ -240,6 +240,11 @@ def execute(self):
         self.ask_cors()
         self.print_separator()
         if self.ask_summary():
+            self.print_separator()
+            print(
+                "Warning: The following information contains sensitive values. "
+                "Be careful when copying and pasting."
+            )
             self.print_separator()
             self.create_bucket()