* fix(provider): do not pass a param to estimate_gas
* fix(provider): pass correct number of args to new_filter
* test(signer): add test to ensure that the Pending block number works
* docs: fix links
* feat(types): add optional Celo support
* feat: add Celo feature flags to all crates
* test(provider): add get_transaction celo test
* test(signer): add send_transaction celo test
* test(contract): add deploy and call contract function celo test