Fix date in changelog

Fix date in changelog

for release v0.12.1: update tendermint dependency and update changelog (

cosmos#125) (cosmos#126)

Merge pull request cosmos#120 from tendermint/develop

Develop

Release v0.11.1, using GoAmino v14

Release 0.11.0 (cosmos#112)

See full changelog here:
https://github.com/tendermint/iavl/blob/develop/CHANGELOG.md#0110-september-7-2018

* Update to CircleCI 2.0 (cosmos#108)

* Use 8 bytes to store int64 components of database keys  (cosmos#107)

* Introduce KeyFormat that uses a full 8 bytes for int64 values and avoids string manipulatio/scanning

* Add node key and orphan key benchmark

* Fix various issue from PR: punctuation, add overflow test, and improve
scan function

* Remove architecture dependent getter functions (cosmos#96)

* Remove architecture dependent getter functions

* update changelog

* Prep Release 0.11.0 (cosmos#111)

* Bump version and update change-log

Release 0.10.0 (cosmos#100)


* dep: Change tendermint dep to be ^v0.22.0 (cosmos#91)

* Mutable/Immutable refactor and GetImmutable snapshots (cosmos#92)

* Release 0.10.0: Update Changelog and bump version (cosmos#99)

See changelog: https://github.com/tendermint/iavl/blob/develop/CHANGELOG.md#0100

Add OpDecoders

Return nil on empty tree - bump version to 0.10.0

Bump version to 0.9.3