change error message for Default variant

src/command/parser_error.rs

@@ -13,7 +13,7 @@ impl fmt::Display for ParserError {
 		match self {
 			Self::Empty => fmt::Display::fmt("No command provided", f),
 			Self::Unknown => fmt::Display::fmt("Unknown command", f),
-			Self::Default => fmt::Display::fmt("Internal error", f),
+			Self::Default => fmt::Display::fmt("Unknown command", f),
 		}
 	}
 }