Added changelog.  Initial open source release is 2.0.0.
Added changelog.  Initial open source release is 2.0.0.


googlearchive/acre,freebase/acre,googlearchive/acre,googlearchive/acre,googlearchive/acre,googlearchive/acre,freebase/acre,freebase/acre,freebase/acre,freebase/acre,freebase/acre,googlearchive/acre