Getting ready for the Vyper's beta launch

[ben-kaufman]

Hey everyone,

Vyper is getting ready for its first beta launch (hopefully on June 1st) and I think Casper should start preparing for that as there are lots of changes (some are backwards incompatible).

I'll go through the Casper contract code this week and list here the important changes.
I think as we settle on the right units in #138 we should post it here as well.

What do you think?

[djrtwo]

I'm down to help get prepared. We are currently tied to the vyper version commit right after the big eth-tester merge. What else has changed since then?

[ben-kaufman]

I'm pretty sure that the transition Vyper had in wei_value from int128 to uint256 was after that.
I'll go through the code and write the comments.

[djrtwo]

Cool. I'm planning on converting (almost) all of our int128s to uint256 so that should fix that issue.

[djrtwo]

I'm working on this @ChihChengLiang