Update README.md

Author: Son-HNguyen

README.md

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 News
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+#### Version [v1.8.3](https://github.com/3dcitydb/3dcitydb-web-map/releases/tag/v1.8.3) released (*May 15, 2020*)
 #### Version [v1.8.2](https://github.com/3dcitydb/3dcitydb-web-map/releases/tag/v1.8.2) released (*Jan 17, 2020*)
 #### Version [v1.8.1](https://github.com/3dcitydb/3dcitydb-web-map/releases/tag/v1.8.1) released (*Dec 2, 2019*)
 In preparation of Google Fusion Tables being shut down by Google: Extend the 3DCityDB Web Client to support further data sources such as Google Spreadsheets (using Google Sheets API v4) and directly from PostgreSQL (using PostgREST API).