v0.3.8

#689: Add more type annotations and do some code cleanup in AttackedText
notably removed some code that did Chinese word segmentation because it did not properly
support words_from_text, which caused issues with various transformations.

#691: Optimize comparison between two AttackedText objects (thanks @plasmashen!)

#693: Fix bug with writing parameters twice in AttackedText (thanks @89x98!)

#700: Lots of miscellaneous bug fixes and some helper function implementation

#701: Fix bugs with loading TedTalk translation dataset, using T5, seq2sick/text-to-text goal functions