1.0.18

• Adds annotations events on iOS (#32).

Usage:

PSPDFKit.addEventListener('onAnnotationsChanged', function(event){
  console.log('Changed annotations: ' + JSON.stringify(event["annotations"]));
});

PSPDFKit.addEventListener('onAnnotationsAdded', function(event){
  console.log('Added annotations: ' + JSON.stringify(event["annotations"]));
});

PSPDFKit.addEventListener('onAnnotationsRemoved', function(event){
  console.log('Removed annotations: ' + JSON.stringify(event["annotations"]));
});