Fix formatting mistakes in readme.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@988825 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add `chart` attribute for easy Google Charts API visualizations.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@988826 b8457f37-d9ea-0310-8a92-e5e31aec5664
Support all `corechart` charts, selective JS loading, add `title`.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@988827 b8457f37-d9ea-0310-8a92-e5e31aec5664
Document `chart` attribute & supported graph types, version bump to 0.6.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@988828 b8457f37-d9ea-0310-8a92-e5e31aec5664