Bump follow-redirects and ibm-watson

Bumps [follow-redirects](https://github.com/follow-redirects/follow-redirects) to 1.15.6 and updates ancestor dependency [ibm-watson](https://github.com/watson-developer-cloud/node-sdk). These dependencies need to be updated together.


Updates `follow-redirects` from 1.5.10 to 1.15.6
- [Release notes](https://github.com/follow-redirects/follow-redirects/releases)
- [Commits](follow-redirects/follow-redirects@v1.5.10...v1.15.6)

Updates `ibm-watson` from 5.7.0 to 9.0.1
- [Release notes](https://github.com/watson-developer-cloud/node-sdk/releases)
- [Changelog](https://github.com/watson-developer-cloud/node-sdk/blob/master/CHANGELOG.md)
- [Commits](watson-developer-cloud/node-sdk@v5.7.0...v9.0.1)

---
updated-dependencies:
- dependency-name: follow-redirects
  dependency-type: indirect
- dependency-name: ibm-watson
  dependency-type: direct:production
...

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