minSockets confusion

[egirshov]

While using let's say ForeverAgent({maxSockets: 5}) is clear (allocate up to 5 sockets), in order to create a pool with exactly one socket I need to pass options {maxSockets: 1, minSockets: 2} as minSockets means something like "minimal amount of sockets to be kept in the pool" + 1.

Changing < to <= in https://github.com/mikeal/forever-agent/blob/master/index.js#L22 will fix it, however I understand that doing that will affect current users, so if that is not possible clarification in the doc will be good enough.