Add a buffer for min_value before attempting send

[tomreece]

Currently Pucauto accepts a bundle if the recipient has points >= min_value.

Make it points >= min_value + BUFFER.

[eengstrom]

Would this be an attempt to ensure that the recipient's points aren't all used up before Pucauto gets to send all of our matching cards? I'm not sure I would use that feature, so can the buffer be a config option?

[tomreece]

@eengstrom Yes, the goal is to ensure min_value is met in case some cards are grabbed by other users. I'm not sure what buffer value should be, but it will be configurable and optional.