Raiden-contracts

- New deployments for both mainnet and testnets (goerli, rinkeby, ropsten)
- Updated disclaimer

- Fix `CONTRACTS_VERSION`, which was outdated in 0.37.0-b2.

- [1376](https://github.com/raiden-network/raiden-contracts/pull/1376) Support verification of TokenNetworks
- Test release of contracts on mainnet for Brainbot-internal testing. Do not use for anything else! The deprecation switch will be triggered soon!

- Practice deployment for next mainnet release

- [1372](https://github.com/raiden-network/raiden-contracts/pull/1372) Rename network to chain for consistency
- [1371](https://github.com/raiden-network/raiden-contracts/pull/1371) Update `web3` and improve typing
- [1363](https://github.com/raiden-network/raiden-contracts/pull/1363) Update `solc` to 0.6.3

- [1339](https://github.com/raiden-network/raiden-contracts/pull/1339) Update `web3` and related dependencies. This also enables an Istanbul compatible test chain.
- [1361](https://github.com/raiden-network/raiden-contracts/pull/1361) Require `--service-registry-controller` during service contracts deployment.
- [1360](https://github.com/raiden-network/raiden-contracts/pull/1360) Add Python 3.8 support