addAdmin command isn't working as expected

[nus-pe-script]

Describe the bug
Shows an error message when you type in 'addAdmin jane Software2! Software2!' even though the password meets the requirements

To Reproduce
Steps to reproduce the behavior:

1. open jar file
2. login with default userid and password
3. type in 'addAdmin jane Software2! Software2!' and enter
4. See error

Expected behavior
expected to see a successful account made message

Screenshots
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Additional context
Add any other context about the problem here.

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Reported by: @sanjukta99
Severity: Medium

_{[original: nusCS2113-AY1819S1/pe-1#252]}

[Psyf]

Thank you for pointing it out.
I'll look into it.

[trufflepirate]

@saif, yeah your! Is illegal char

[Psyf]

@trufflepirate yep just realized only legal ones are [@#$%^&+=]
Updating the addAdmin help prompt accordingly.

P.S that's not my account. I'm at @Psyf haha

Addressed in #129