Add wizard and BERT to website news
<h2>News</h2>
+2019-03-15: The [Wizard of Wikipedia project page](http://parl.ai/projects/wizard_of_wikipedia/) is updated with pretrained models and specialized model code.
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2019-03-09: Added [LIGHT](http://parl.ai/projects/light) text adventure game research platform for learning to speak and act. [[press]](https://venturebeat.com/2019/03/08/facebook-ai-researchers-create-a-text-based-adventure-to-study-how-ai-speak-and-act/)
+2019-02-07: Added [BERT Ranker agents](https://github.com/facebookresearch/ParlAI/tree/master/parlai/agents/bert_ranker), several variations of a ranking model based on the pretrained language model BERT.
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2019-01-16: ParlAI has been relicensed under the MIT open source license.
2018-12-13: Added [Daily Dialog](https://github.com/facebookresearch/ParlAI/blob/master/parlai/tasks/dailydialog/agents.py), an open-domain daily dialogue dataset.
