Add changelog entry about deprecating EVMC_LATEST_REVISION
## [6.1.0-dev] - unreleased
+- Deprecated: [[#184](https://github.com/ethereum/evmc/pull/184)]
+ The `EVMC_LATEST_REVISION` is deprecated, replaced with `EVMC_MAX_REVISION`.
+
## [6.0.2] - 2019-01-16
- Fixed: [[#179](https://github.com/ethereum/evmc/pull/179)]
