ChangeLog: Document changes since v1.0.0-rc2
ChangeLog: Document changes since v1.0.0-rc2

Through d12da90 (Merge pull request #633 from
WeiZhang555/syncup-hook-state, 2016-12-06).

Signed-off-by: W. Trevor King <f75897670c17327c42ab201733fb8a81ff9f4c34@tremily.us>

wking/opencontainer-runtime-spec,laijs/specs,hqhq/runtime-spec,cloudfoundry-incubator/specs,opencontainers/runtime-spec,wking/opencontainer-specs,opencontainers/specs,hqhq/specs