Bot claims it can't determine any contributions, but in fact it does correctly identify them

**Describe the bug**
all-contributors bot says:

> I couldn't determine any contributions to add, did you specify any contributions?

But the resulting PR does the job correctly.

My comment was:

```
@ all-contributors please add @ X for userTesting and bug.
```

Possibly that syntax was unexpected/incorrect, but it seems to work anyway. (in the original message there was no space between the @ and the names of course)

This is the issue where I added the comment that the bot picked up: https://github.com/cleodora-forecasting/cleodora/issues/171 and this is the resulting (correct) PR: https://github.com/cleodora-forecasting/cleodora/pull/172

**Expected behavior**
No error message or the bot failing to correctly add the two contributions.