Tweet on Raid completion

- [x] Create an OSRG twitter account
- [ ] Update `completeRaid` to send a tweet
  - Use the following template:

```
Raid Complete!
{{Link to Raid PR}}
{{Raid Title}}
⚔️ {{X}} Contributors
🗃️ {{Y}} Files Changed
💻 {{Z}} Commits 
📆 {{A}} Days
```