Build issue with typed-ast package

[tomhepworth]

I had build issues that prevented me from running make successfully. The errors were to do with the python install of the typed-ast package, saying that the system could not find a PyArena type.

This is an issue with the typed-ast package, which was patched in version 1.4.3.
I was able to fix the build issues by changing the version of the typed-ast package in requirements.txt

old:

typed-ast==1.4.0

new

typed-ast==1.4.3

Leaving this here in case it it useful to anyone

[ManuelonGithub]

@tomhepworth Thank you so much that solved my problem!
Definitely needs to be fixed..