v4.2.0

Bug Fixes

• deps: update dependency @grpc/grpc-js to ^0.5.0 (#461) (1850f25)
• deps: update dependency google-auth-library to v5 (#462) (1f97053)
• types: correct type of Datastore.KEY (#459) (09def6d)
• allow calls with no request, add JSON proto (771b634)

Features

• add support for appengine legacy url encoding (#456) (357a9cf)
• excludeFromIndex allow for '*' wildcard to catch all properties on object (#451) (215cbee)