v0.9.1

• Exclude a property's trailing semicolon if no value is set.

  Example:

  event.addProp('ATTENDEE', null, {
    CN: 'Sample Company',
    RSVP: 'FALSE:mailto:sample@example.com'
  }

  Now produces this:

  ATTENDEE;CN=Sample Company;RSVP=FALSE:mailto:sample@example.com
  

  Instead of this:

  ATTENDEE;CN=Sample Company;RSVP=FALSE:mailto:sample@example.com:
  

  (Note the trailing semicolon)