Add method to preemptively open payment channel

[Evan Schwartz]

For my use case I'd like to ensure that a payment channel is opened to the receiver when the sender starts up (and I can get the receiver's address before I actually want to load content from them). It would be nice if there were an easy way to open a payment channel without actually paying the receiver.

[Sergey Ukustov]

There is a (hacky) way for doing this:

1. Instantiate Machinomy object, setting minimumChannelAmount to an expected channel amount (https://github.com/machinomy/machinomy/blob/master/index.ts#L48 and https://github.com/machinomy/machinomy/blob/master/index.ts#L109).
2. Do machinomy.buy with price set to 0. (https://github.com/machinomy/machinomy/blob/master/index.ts#L21)

Would that fit the case?

[Evan Schwartz]

Yup, that worked. Thanks!

[Sergey Ukustov]

Yay! Cool.