Adding blog post announcement to README
![DataHub](docs/imgs/datahub-logo.png)
-> :sparkles: Feb 2020 Update: *DataHub v0.3.0* just [released](https://github.com/linkedin/datahub/releases/tag/v0.3.0)!
+> :sparkles:Feb 2020 Update:
+> - Our [blog post](https://engineering.linkedin.com/blog/2020/open-sourcing-datahub--linkedins-metadata-search-and-discovery-p) on open sourcing DataHub is out!
+> - *DataHub v0.3.0* is [released](https://github.com/linkedin/datahub/releases/tag/v0.3.0)!
## Introduction
DataHub is LinkedIn's generalized metadata search & discovery tool. To learn more about DataHub, check out our
