Preprocessing missing a file

[TITC]

this repo missing a file which could cause the below error

Error: Cannot find module './LaTeX-OCR/pix2tex/dataset/preprocessing/third_party/match-at/lib/matchAt.js'. Please verify that the package.json has a valid "main" entry

copy from im2markup

and I am not sure whether you encountered this issue or not?

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe7 in position 2270: invalid continuation byte

if you encountered it, I think it would be better to add a prompt that uses python2.7 on readme.

[TITC]

I not know so many commit will show in PR.......

please ignore them and just see last commit a2a5b0b

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I am not familiar with git operation, sorry for doing some stupid things, but I think you can get my point.