0.4
    - provides convenient classes under GlusterFS::GFAPI::FFI::*
    - unit-test with mocking up
0.3
    - supports scatter/gather I/O
    - provides GlusterFS::GFAPI::FFI::File class
0.2     2018-02-01 15:30:40 Asia/Seoul
    - supports and verified all functions that excepts *_async()
0.1     2017-05-17 17:23:53 Asia/Seoul
    - supports and verified default facility functions
0.01    2017-05-13 19:21:45 Asia/Seoul
    - Initial release