Update README.md

Updated list of maintainers to accurately reflect past maintainers.

Author: sharilaster

README.md

@@ -3,12 +3,13 @@
 # Maintainers for Library Carpentry: Introduction to Working with Data (Regular Expressions)
 
 - [Shari Laster](https://github.com/sharilaster) (Lead)
-- [Paul R. Pival](https://github.com/ppival)
-- [Anton Angelo](https://github.com/antonangelo)
-- [Carmi Cronje](https://github.com/ccronje)
 
 # Past Maintainers
 
+- [Angela Zoss](https://github.com/amzoss)
+- [Paul R. Pival](https://github.com/ppival)
+- [Carmi Cronje](https://github.com/ccronje)
+- [Anton Angelo](https://github.com/antonangelo)
 - [James Baker](https://github.com/drjwbaker)
 - [Chris Erdmann](https://github.com/libcce)