* Fixed circleci config and fixed linting warnings
* Updated circleCI for go version 1.12 and split jobs for build/testing
* updated go version to 1.12.5 for circleCI
* Go mod tidy dependencies
* Updated linting tools and cleared up code lint smells
* Added workflow to run build and test jobs
* Moved linting command to build workflow
* Get dependencies before linting by default
* Added go module flag to linter and increased deadline to pull packages
* Rename Ethereum tx message
* Use new tx decoder in the ethermint app
* Update ante handler to prevent spam/dos
* Update ethereum msg signing/verification logic
* Implement secp256k1 key types
* Remove pointer from To method
* Move sig check to after inartistic gas check
* Add comment on chainID parsing
* Updated validateIntrinsicGas godoc
* Implement Fee method on eth tx msg
* Add reference to spec for recoverEthSig
* Upgrade TM to v0.27.0
