v0.2.1

• Support for decrypting encrypted media streams that use ContentProtection, via the Bento4
  mp4decrypt commandline application. See the --key commandline argument to allow kid:key pairs to
  be specified, and the --mp4decrypt-location commandline argument to specify a non-standard
  location for the mp4decrypt binary.

• Fix a bug in the handling of the --add-header commandline argument.