fixed Readme typo in NaNs example

[RashJrEdmund]

• was reading through docs and saw the typo in this example.

  • see the "invalid_type_error" key-value pair below

• changed to :

  • "isNaN must be 'not a number'"

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[TahsinAyman]

I think it makes sense

[RashJrEdmund]

Well, I now understand what it meant.
is Nan must be not a number.
I see why I got confused.
I'll fix that right a way.

[colinhacks]

Can't remember why I used NaN as an example for these lol. Guess I was feeling troll-y that day. Your change makes it a bit clearer, thanks.

[RashJrEdmund]

thank you too