Missing parenthesis in to displayFormAtt() function

Hi,

First I want to thank you for your great Plugin!

I noticed that after the allowed file types and max file size there is a parenthesis missing. I wanted to submit a pull request until I realized that I was working on a mirror repository ??

Here are my subtle changes: https://github.com/ericstumper/comment-attachment/commit/627267f3d543ab5ef58fd0d5b83938ab98555efd

I hope you are able to fix this soon. Thanks a lot in advance.

Eric

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