Fix credits newline in Readme.
Fix typo in README.
Add note that this plugin can also be used to output a menu above the header, instead of inside of it.
Fix check for incorrect location name.
Add note for how to remove the menu on a landing page, for example.
Simplify nav menu registration

register_nav_menu( $location, $description ) is actually just a wrapper for register_nav_menus( array( $location => $description ) ) (plural-named function). That is, register_nav_menus() takes an associative array of locations and descriptions, so using that directly saves an extra function call.
Add support for GitHub Updater plugin.
Update README.
Bump version number