Fix Bundle swapout
Fix Bundle swapout

Busted because I forgot that it's a by-pointer field MiniStats.  A
demonstration in a way which := with type inference can be somewhat
deceptive in some scenarios.

Signed-off-by: Daniel Farina <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@fdr.io>

logplex/logplexc,heroku/logplexc