Sol v0.8

[RyanRHall]

This PR does the following:

• upgrades the DateTime contract to sol v0.8
• introduces brownie as a dependency for running tests locally
• adds a CI workflow to hopefully make future changes easier to manage

[pipermerriam]

Should I expect the CI workflow to run in this PR? I did a quick check of permissions and it seems it should be running.

[lightclient]

maybe a typo? usually i see this as on: [push]

[RyanRHall]

@pipermerriam I'm guessing we're not seeing the CI runs because the PR is cross-repository. Probably some github policy. When I make PRs onto our fork of the repo, CI works fine.

If you want to see the CI run before merging, you'll probably have to pull this branch, push up a local copy, and open a new PR.

[RyanRHall]

According to github, you should be able to "approve and run" @pipermerriam
https://docs.github.com/en/actions/managing-workflow-runs/approving-workflow-runs-from-public-forks#approving-workflow-runs-on-a-pull-request-from-a-public-fork

[pipermerriam]

lets see if this enables the workflow?

[lightclient]

Maybe try to rename ci.yml to ci.yaml?

[RyanRHall]

Maybe try to rename ci.yml to ci.yaml?

CI works fine. It's just disabled for outside contributors.