- [mempool] [\#3877](https://github.com/tendermint/tendermint/pull/3877) Make `max_tx_bytes` configurable instead of `max_msg_bytes` (@bluele)
- [privval] [\#3370](https://github.com/tendermint/tendermint/issues/3370) Refactor and simplify validator/kms connection handling. Please refer to [this comment](https://github.com/tendermint/tendermint/pull/3370#issue-257360971) for details
- [rpc] [\#3880](https://github.com/tendermint/tendermint/issues/3880) Document endpoints with `swagger`, introduce contract tests of implementation against documentation
### BUG FIXES:
- [config] [\#3868](https://github.com/tendermint/tendermint/issues/3868) Move misplaced `max_msg_bytes` into mempool section (@bluele)
- [rpc] [\#3910](https://github.com/tendermint/tendermint/pull/3910) Fix DATA RACE in HTTP client (@gchaincl)
- [privval] \#3370 Refactors and simplifies validator/kms connection handling. Please refer to thttps://github.com/tendermint/tendermint/pull/3370#issue-257360971