Add PUT and POST methods

[ururk]

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[ururk]

This includes a new feature - and uses a different library than request. Promises instead of callbacks, which allows the use of await:

let response = await jamf.get(`/mobiledevices/serialnumber/${serial_number}`);

It breaks the interface a bit - since the second parameter used to be a callback, code will have to be rewritten to use these new features.