add projects (Squirtle and Tensorbase) to list in readme (#312)

Co-authored-by: Parth Sarthy <parth.sarthy@udemy.com>

README.md

@@ -55,6 +55,8 @@ Here are some of the projects known to use DataFusion:
 * [delta-rs](https://github.com/delta-io/delta-rs)
 * [InfluxDB IOx](https://github.com/influxdata/influxdb_iox) Time Series Database
 * [ROAPI](https://github.com/roapi/roapi)
+* [Tensorbase](https://github.com/tensorbase/tensorbase)
+* [Squirtle](https://github.com/DSLAM-UMD/Squirtle)
 
 (if you know of another project, please submit a PR to add a link!)