update node 3.x release notes to include version 3.0.7

Node 3.x SDK release notes shows latest version is 3.0.6:

https://docs.couchbase.com/nodejs-sdk/current/project-docs/sdk-release-notes.html

But the latest version is 3.0.7 as seen in the npm registry:

https://www.npmjs.com/package/couchbase

Please update the release notes.