Updated my fork: type annotation support + f-string fixes

[achimnol]

https://github.com/achimnol/python-syntax
I have recently updated my own fork to support type annotations and fix some bugs in f-string highlighting. I didn't notice this new "official" fork here, so need to rebase my changes.
Please try a look on my new patches – and if you like those, I will make a new PR here.

[nfnty]

I won't have time to review your patches before you've rebased. PRs are very welcome if there's something that needs to be improved.

[mr-ubik]

Type annotation would be very welcomed.

[rminderhoud]

Adding my +1 for type annotations

[nfnty]

@achimnol I'd be very interested in merging this functionality if you open PRs.