Bump version to 0.4.2.
Bump version to 0.4.2.

apigee/tablesnap,juiceblender/tablesnap,heroku/tablesnap,tamsky/tablesnap,russss/tablesnap,juiceblender/tablesnap,JeremyGrosser/tablesnap,russss/tablesnap,apigee/tablesnap,curalate/tablesnap,amorton/cassback,ethanmiller/tablesnap,JeremyGrosser/tablesnap,betable/tablesnap,betable/tablesnap