* fix(block): fix block decoding from ws
* feat(pubsub): add pubsub traits and sub stream
Also use DeserializeOwned alias
* feat(transports): add notification type
* feat(ws): rewrite Ws for subscription support
* feat(provider): add eth_subscribe
* fix(celo): disable some celo tests due to ganache incompatibilities
* test(rinkeby): fix flaky test
* feat(contract): WS subscription bindings (#101)
* feat(middleware): add subscriptions to middleware methods
* feat(contract): add subscribe method to contracts
* fix(signers): make Signer send by blocking on Ledger calls
* fix(providers): use Arc in WS impl to allow cloning
* feat(middleware): add geometric gas price escalator
* test(middleware): ensure that we can still stack everything up
* fix(middleware): default to tokio/async-std
* chore: fix clippy
* docs(middleware): add docs and rename middlewares
* chore: fix doctests
* feat: add linear gas escalator
https://github.com/makerdao/pymaker/blob/master/tests/test_gas.py\#L107https://github.com/makerdao/pymaker/blob/master/pymaker/gas.py\#L129
* feat: add constructors to gas escalators