Uniswap-python

What's Changed
* fix: fixed invalid balance check (closes 25) by ErikBjare in https://github.com/uniswap-python/uniswap-python/pull/30
* fix: fixed error when passing WETH as token to get_token_token_{output/input}_price (fixes 22) by ErikBjare in https://github.com/uniswap-python/uniswap-python/pull/31


**Full Changelog**: https://github.com/uniswap-python/uniswap-python/compare/0.4.3...0.4.4

- Provide token inputs as addresses instead of names

- Add ability to transfer tokens after a trade
- Add tests for this new functionality

- Add tests for all types of trades