Javascript-SDK - v1.3.0

* Bump optimizely-server-sdk to version 1.2.0, which includes:
- Introduce support for event tags.
- Add optional eventTags argument to track method signature.
- Removed optional eventValue argument from track method signature.
- Removed optional sessionId argument from activate and track method signatures.
- Allow log level config on createInstance method


https://github.com/optimizely/javascript-sdk/releases/tag/v1.3.0