Release 0.17.0 (rust-rocksdb#539)

Release 0.16.0 (rust-rocksdb#508)

Release 0.15.0 (rust-rocksdb#458)

Release 0.14.0 (rust-rocksdb#408)

Release 0.13.0 (rust-rocksdb#351)

Release 0.12.4

Merge pull request rust-rocksdb#317 from aleksuss/release-0-12-3

Release 0.12.3

Merge pull request rust-rocksdb#296 from crisp-dev/master

Add `rocksdb_flush` method on DB

Preparing for 0.12.1 release [skip ci]

Releasing v0.12.0...