Black extension shouldn't remove semi-colons when formatting Notebooks

[nickeubank]

Currently when run against Notebooks, the ms black extension removes semi-colons. But in Jupyter notebooks, a semi-colon has meaning—it tells the notebook to not print the output from that line (as it normally would by default for the last line in a cell). When writing notebooks for instruction, this can be annoying.

An example of where this comes up—note after running black on the notebook, I have to go back and re-add in ; to prevent several hundred line outputs.

Note that Black itself respects semi-colons when formatting notebooks, the problem seems specific to the ms extension

[karthiknadig]

Closing this in favor of #87

Currently we are blocked on openlawlibrary/pygls#311 to provide full notebooks support in the extension.