Incorrect confirmation message on entering invalid done command

[Sukrut1881]

When I enter "done 2-1"

The app corrrectly does not update the 2 tasks but displays a confirmation message of having marked them as complete.

[nus-pe-bot]

Team's Response

This is an intended behavior that we don't allow putting starting index higher than ending index, but definitely we should have put an error message for that instead of accepting the command.

Items for the Tester to Verify

❓ Issue severity

Team chose [severity.Low].
Originally [severity.High].

• I disagree

Reason for disagreement: [replace this with your reason]

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