Javascript-SDK - 2.0.3
* Add package-lock.json ([#100](https://github.com/optimizely/javascript-sdk/pull/100))
* Input validation in Activate, Track, and GetVariation methods ([#91](https://github.com/optimizely/javascript-sdk/pull/91) by [@mfahadahmed](https://github.com/mfahadahmed))
https://github.com/optimizely/javascript-sdk/releases/tag/v2.0.3
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