* Expose types at the top level

While the modules are great for organizing the code internally, it is more
convenient for users of the create when the types are available at the top
level. This avoids the verbosity like "map::Map".

* Changelog updated

Removed the lines stating where which class has been moved, since all these
classes are not available at the top level again.

Also removed some things which I didn't think we actually noteworthy for people
reading up on what had changed.

* Restored some changelog items

Removal of these items unrelated to how the data types are exposed.

Update CI link
Remove things from "Things missing" that were added
Update example to use `parse_file`

If I don't forget to publish the changes then I forget to update the README. *sigh*

 * change readme build button back since this will be a pull request

Before this commit parse took an EventReader. Change so that it takes a
Buffer