v4.4.0

Bug Fixes

• transaction#run overloads' param types correction (#501) (c88e66e)
• deps: update dependency @grpc/grpc-js to ^0.6.0 (#503) (7c3c213)
• use compatible version of google-gax (567e9dd)

Features

• .d.ts for protos (#506) (869e673)
• add merge method for merging an object into an existing entity (#452) (8e026af)