use nats --pre as the latest final has broken deps
use nats --pre as the latest final has broken deps

Signed-off-by: Ruth Byers <47d9a6cf87fc30102bd5f0e7c094d83115b4c83e@pivotallabs.com>

ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,dramich/cf-bigip-ctlr,dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr