create changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [Upcomming]
+- automatic cleanup of lz4 buffer files
+- integrity checks on startup
+- easier-to-use indexing abstractions
+- LMDB implementation of MetaDB
+
+## [0.0.1] - 2018-10-25
+### Added
+- Cipher interface
+- Compressor interface
+- MetaDB interface
+- BoltDB implementation of MetaDB
+- Filelock
+- God level DB struct with options
+- Pluggable zap logger
+- Async reader implements context cancellation
+- extended test coverage
+
+### Changed
+- removed hardcoded encryption and compression
+- removed hardcoded LMDB as metadb
+- minor breaking API changes with abdullin/cellar
+
+## [0.0.0] - abdullin/cellar
+original fork of abdullin/cellar