Update changelog to prepare for 1.0.1.

git-svn-id: https://plugins.svn.wordpress.org/eventbrite-api/trunk@1043554 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tag v1.0.1.

git-svn-id: https://plugins.svn.wordpress.org/eventbrite-api/trunk@1043557 b8457f37-d9ea-0310-8a92-e5e31aec5664