Update sympy live to 1.6

[oscarbenjamin]

SymPy Live needs to be updated to sympy 1.6.

One part of the release process for sympy is to update sympy live. I actually think that that should not be the responsibility of the release manager (which is me...).

When releasing 1.5 I really struggled to update sympy live because of various changes in google-app-engine. Working around those was definitely outside of my expertise but luckily my brother was around at some point and helped me figure it out. I think it's definitely better if we have someone who is more familiar with sympy live keeping on top of updates to it.

Can someone (else) update sympy live to 1.6?

[oscarbenjamin]

At the time I opened #139 with some changes but it is still unmerged. Probably it can be closed now.

[prshnt19]

To update SymPy to 1.6 we need to update SymPy Live to Python3 first. For that issue #161 has already been opened. Once they are resolved SymPy can also be updated. We need to decide which framework to use for that. See #157.

[oscarbenjamin]

What's the current status of this?

[prshnt19]

Things that are done can be seen at https://github.com/sympy/sympy-live/projects/1.
Next thing is to decide which framework to choose between Django and Flask.