Update maintainer's list based on current statuses

Author: Bisaloo

README.md

@@ -15,14 +15,16 @@ allows us to change the content of the lesson website.
 The following people are maintainers for this lesson, and are responsible for determining which
 changes to incorporate into the lesson:
 
+- Thomas Cason (@tecason)
 - [Rohit Goswami](https://carpentries.org/instructors/#HaoZeke) (@haozeke)
 - [Hugo Gruson](https://carpentries.org/instructors/#bisaloo) (@Bisaloo)
-- [Isaac Jennings](https://carpentries.org/maintainers/#isaac-jennings) (@isaac-jennings)
+- Katie O'Mahony (@aforestsomewhere)
 
 Alumni:
 
 - [Daniel Chen](https://software-carpentry.org/team/#chen_daniel) (@chendaniely)
 - [Diya Das](https://diyadas.github.io) (@diyadas)
+- [Isaac Jennings](https://carpentries.org/maintainers/#isaac-jennings) (@isaac-jennings)
 - [Katrin Leinweber](https://carpentries.org/instructors/#katrinleinweber) (@katrinleinweber)
 
 The goal of this lesson is to teach novice programmers to write modular code to