Update README.md

updated README

2020-04-23 | Multi-hop Delta Lake Streaming/README.md

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+## Predictive Maintenance (PdM) on IoT Data for Early Fault Detection w/ Delta Lake
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+2020-04-23 | [Watch the video](https://www.youtube.com/watch?v=68zy_nSV8g0) | This folder contains the presentation and sample notebooks
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 <i> Note: </i> Multiple personas are involved along different points of a data pipeline
 
 This demo is a multi-notebook approach keeping these personas in mind i.e. there is division of labor where Data Investigation tasks are demoed in separate notebooks to emphasize that you can be involved in a part or the whole pipeline depending on what you choose.