Update TimestampableListener.php

[trsteel88]

Removed unnecessary use statement

[docteurklein]

thanks!

[trsteel88]

No worries.

I understand this may not be the best channel to communicate, but I was wondering if you had any examples of using the Tree Behavior with forms?

Basically, I want to have a parent dropdown in a form. If the parent changes, obviously I need to update the tree which I suppose could be done with a listener similar to the Timestampable listener.

Also, it may be common for entities using the tree to have "getChildren" method already implemented. Do you think that the "getChildren", "addChild" methods should be renamed to "getChildNodes" and "addChildNode" so these methods aren't overwritten?

[docteurklein]

see #38 and #39