SetPlatform is overloaded

[Naatan]

Rollbar seems to use platform for two distinct purposes:

• Identifying the operating system
• Identifying whether a request is coming from a "client"

I work on a CLI app that uses a client token, and so we send "client" for the platform because otherwise, the client token would not work as per the documentation:

post_client_item
Allows access to POST client-side items (platform is android,browser, client, flash, or ios)

This means that I can't send the operating system to rollbar without violating the intend of the API tokens, which is a strange limitation to have.