Update PasswordStrength.php

Fix spelling
Merge pull request #11 from nurikabe/patch-1

merge #11 Update PasswordStrength.php (nurikabe)

This PR was merged into rollerworks:master branch.

Discussion
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Fix spelling

Commits
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74172d27455d651b054eece8404f3baa366688d9 Update PasswordStrength.php (nurikabe)