v0.3.0

Vote PASSED [+5 -0]: [1]

There have been 14 PRs merged since v0.2.0, [2] has the list.

[1] https://groups.google.com/a/opencontainers.org/forum/#!topic/dev/eXPEJHDvYIg
[2] #183

Signed-off-by: zhouhao zhouhao@cn.fujitsu.com