Update README.md to prepare for open source.
Update README.md to prepare for open source.

Change-Id: I317101cb6eb6da6a8a70c7ddd2dcd9a262aa7550

geigerj/toolkit,googleapis/gapic-generator,shinfan/toolkit,shinfan/toolkit,tcoffee-google/toolkit,googleapis/gapic-generator,jcanizales/toolkit,swcloud/toolkit,googleapis/gapic-generator,googleapis/gapic-generator,swcloud/toolkit,saicheems/toolkit,jmuk/toolkit,swcloud/toolkit,shinfan/toolkit,googleapis/gapic-generator,googleapis/gapic-generator,swcloud/toolkit,googleapis/gapic-generator,shinfan/toolkit,jcanizales/toolkit,shinfan/toolkit,swcloud/toolkit,saicheems/toolkit