change User agent

[Klap-in]

According to juruen/rmapi#23 (comment) you may now provide your own user agent string.

I guess it is about this...

ReMarkableAPI/src/RemarkableAPI.php

Line 69 in 5eafff7

'deviceDesc' => 'desktop-windows', # we have to lie here

[splitbrain]

Hmm from what I understand, @oyvindsk suggests to use the HTTP user agent to supplement what we provide in the deviceDesc. So basically he's saying please continue to lie, but we will use the User-Agent to see that you're lying for our statistics. We're currently not setting any specific HTTP user agent so it will probably identify as Guzzle? PR welcome.

[Klap-in]

Ah, makes sense.