Fixes numbering in README
Fixes numbering in README

Bug: 80191803
Change-Id: I4e3ad1321d7c37be8b48d2d7a4ce3fd342808068

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