Updates package version to 0.2.0
Updates package version to 0.2.0

Bug: 112778861
Change-Id: I722fc8968f2e6b0e855f7bdf318888739a4bd29e

actions-on-google/actions-on-google-testing-nodejs,actions-on-google/actions-on-google-testing-nodejs,actions-on-google/actions-on-google-testing-nodejs