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