Vyper

Non-breaking changes and improvements:

- Show contract names in raised exceptions (2103)
- Adjust function offsets to not include decorators (2102)
- Raise certain exception types immediately during module-scoped type checking (2101)

Fixes:

- Pop ``for`` loop values from stack prior to returning (2110)
- Type checking non-literal array index values (2108)
- Meaningful output during ``for`` loop type checking (2096)

Fixed
- Do not fold exponentiation to a negative power ([2089](https://github.com/vyperlang/vyper/pull/2089))
- Add `repr` for mappings ([2090](https://github.com/vyperlang/vyper/pull/2090))
- Literals are only validated once ([2093](https://github.com/vyperlang/vyper/pull/2093))

See release notes:
https://vyper.readthedocs.io/en/stable/release-notes.html#v0-2-1