Vyper v0.4

[stas]

What I did

Mainly fixes and instructions for related issue: #1788

How to verify it

Switch your requirements.txt file to point to this fork by adding these

-eth-brownie==1.20.2
-vyper==0.3.10
+eth-brownie @ git+https://github.com/velodrome-finance/brownie@vyper-v0.4
+vyper==0.4.0

Specify the vyper version in the brownie-config.yaml

+compiler:
+  vyper:
+    version: 0.4.0

Run pip

pip install -r requirements.txt

Checklist

• [ ] I have confirmed that my PR passes all linting checks
• [ ] I have included test cases
• [ ] I have updated the documentation
• [ ] I have added an entry to the changelog