What's Changed
* Added support for ECDSA keypairs by arjanz in https://github.com/polkascan/py-substrate-interface/pull/154
* Automatic gas prediction when omitting `gas_limit` in `ContractInstance.exec()`
* Removed several deprecated keyword arguments
**Full Changelog**: https://github.com/polkascan/py-substrate-interface/compare/v1.0.6...v1.1