Fix README
Fix README

GitHub's Markdown renderer must have changed, since a lot of the headings broke.
emesde/cordova-plugin-geofence,emesde/cordova-plugin-geofence,cowbell/cordova-plugin-geofence,cowbell/cordova-plugin-geofence,cowbell/cordova-plugin-geofence,cowbell/cordova-plugin-geofence,emesde/cordova-plugin-geofence,emesde/cordova-plugin-geofence