How do I access the License API thru here?

[ghost]

Hello, according to Github API docs, you need to attach application/vnd.github.drax-preview+json in the Accept header. Once that is supplied, one should get the license info along with the repo object. However, I tried the following:

const gh = new Github({
  username: 'xxxx',
  password: 'xxxxxx'
}, '', 'application/vnd.github.drax-preview+json').search()

but to no avail. How can I access the License API using this package? Thanks in advance