Broken README link

[austinabell]

ref-contracts/README.md

Line 10 in 173cbce

| [ref-exchange](ref-exchange/src/lib.rs) | [docs](https://ref-finance.gitbook.io/ref-finance/smart-contracts/ref-exchange) | Main exchange contract, that allows to deposit and withdraw tokens, exchange them via various pools |

link whiffs on https://docs.ref.finance/smart-contracts/ref-exchange.

I would open a PR, but unsure what the link should be updated to. Also, since there is ref-farming contract added, unsure if that should be added, along with the other test token. Assume this might want to be updated to https://guide.ref.finance/