Pasting doesn't call notifyTextViewDidChange

[tipa]

Describe the bug
When pasting text/content/... into the TextView, the delegate should be informed / textViewDidChange should be called

Expected behavior
notifyTextViewDidChange is called / the delegate is informed about the text change

Proposed fix
Call notifyTextViewDidChange in these 2 lines:

AztecEditor-iOS/Aztec/Classes/TextKit/TextView.swift

Line 513 in dbe6a0a

}

AztecEditor-iOS/Aztec/Classes/TextKit/TextView.swift

Line 520 in dbe6a0a

}

[SergioEstevao]

Hi there, first of all thanks for the great bug report, do you want to submit a PR for the fix? I will review it and approve it if all goes well. It will also be great to add unit test for this specific crash in order to prevent future regressions.