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

Through a5276ae (Merge pull request #929 from
giuseppe/add-more-implementations, 2017-10-23).

There have also been a few non-spec changes which I have not
documented in the ChangeLog:

13b4639 .pullapprove.yml: Switch to v2 and other project-template
  updates (#902)
f6f2514 README: Make meetings monthly (were weekly) (#910)
e27acdd implementations: Replace "cc-oci-runtime" with "cc-runtime"
  (#922)
ec4cc47 implementations: add crun (#929)
d4990d1 implementations: add bwrap-oci (#929)
8a16f08 .mailmap: Consolidate James' entries (#924)

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

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