Fix typo in README.md (singer -> single)

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Nate Eagleson 2022-05-03 21:45:55 -04:00 committed by GitHub
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@ -395,7 +395,7 @@ grep 'A\|B\|C\|D'
grep 'A.*B'
```
##### Regex any singer character (e.g. ACB or AEB)
##### Regex any single character (e.g. ACB or AEB)
```bash
grep 'A.B'
```