Typo in projects.md

There's a typo on the projects page, sourceing should be changed to sourcing.

Relevant section below:
```
### Bussin' Around
The bus schedule for the Deid. Currently working on open sourceing the source code, [Download it on the App Store](https://apps.apple.com/us/app/bussin-around/id1277005292?ls=1).
```

I can create a pull request if you guys are accepting that.