Made several attributes of StatementParser immutable

The following attributes within StatementParser were converted from mutable lists to immutable tuples:
- terminators
- multiline_commands
- shortcuts

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd2/cmd2.py b/cmd2/cmd2.py
index d13f6335..5e0c1c07 100644
--- a/cmd2/cmd2.py
+++ b/cmd2/cmd2.py
@@ -555,7 +555,7 @@ class Cmd(cmd.Cmd):
         return self.statement_parser.allow_redirection
 
     @property
-    def shortcuts(self) -> List[Tuple[str, str]]:
+    def shortcuts(self) -> Tuple[Tuple[str, str]]:
         """Read-only property to access the shortcuts stored in the StatementParser."""
         return self.statement_parser.shortcuts