Update utils.py

[ZhanruiLiang]

The existing one won't work.

[1mpossibleHacker]

I agree

[taki0112]

I've checked, but it works
Why did you add the comma?

[ZhanruiLiang]

I should've said "won't work as expected". ('true') is the same as 'true' but here I believe the intent here is to have a tuple which should be ('true',). Otherwise you've had used the parens. The current way somehow works but it may surprise users because 'rue' in ('true'), 'u' in ('true'), etc. will also evaluate to True.