fix: handle out-of-range choices

Previously, error handling for choice prompts only covered non-int
values. This fix prevents out-of-range values from throwing an
exception. Fixes #91.

src/nasher/utils/cli.nim

@@ -231,7 +231,7 @@ proc choose*(question: string, choices: openarray[string]): string =
     except IOError:
       result = choices[0]
       echo result
-    except ValueError:
+    except ValueError, IndexDefect:
       if stdin.isatty:
         error("not a valid choice")
         result = choose(question, choices)