add interbtc (btc-parachain) to cryptocurrencies

Signed-off-by: Gregory Hill <gregorydhill@outlook.com>

README.md

@@ -169,6 +169,7 @@ See also [Rust — Production](https://www.rust-lang.org/production) organizatio
 * [Holochain](https://github.com/holochain/holochain) — Scalable P2P alternative to blockchain for all those distributed apps you always wanted to build. The link to the old repo is [this](https://github.com/holochain/holochain-rust) which is no longer maintained. [![Build Status](https://api.travis-ci.com/holochain/holochain-rust.svg?branch=master)](https://travis-ci.com/holochain/holochain-rust)
 * [ibc-rs](https://github.com/informalsystems/ibc-rs) - Rust implementation of the [Interblockchain Communication](https://ibcprotocol.org/) protocol
 * [infincia/bip39-rs](https://github.com/infincia/bip39-rs) — Rust implementation of BIP39.
+* [interBTC](https://github.com/interlay/interbtc) — Trustless and fully decentralized Bitcoin bridge to Polkadot and Kusama.
 * [Joystream](https://github.com/Joystream/joystream) — A user governed video platform [![Build Status](https://api.travis-ci.org/Joystream/joystream.svg?branch=master)](https://travis-ci.org/Joystream/joystream)
 * [Lighthouse](https://github.com/sigp/lighthouse) — Rust Ethereum 2.0 Client [![Build Status](https://github.com/sigp/lighthouse/workflows/test-suite/badge.svg?branch=master)](https://github.com/sigp/lighthouse/actions)
 * [near/nearcore](https://github.com/near/nearcore) — decentralized smart-contract platform for low-end mobile devices.