Update README.md

Author: jyssy

README.md

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 # Maintainers for Library Carpentry: SQL
 
 - [Lise Doucette](https://github.com/librarianlise)
-- [Chris Erdmann](https://github.com/libcce)
 - [Jesse Lambertson](https://github.com/jyssy) (Lead)
 - [Kristin Lee](https://github.com/kristindawn)
 - [Julika Mimkes](https://github.com/mimkes)
 
 Past Maintainers:
 
 - [Janice Chan](https://github.com/icecjan)
+- [Chris Erdmann](https://github.com/libcce)
 - [Jaki Frisina](https://github.com/jfrisina)
 - [Jordan Pedersen](https://github.com/JordanPedersen)
 - [Elaine Wong](https://github.com/elainewong)