Issue #13: Update requirements.txt to ensure comment is valid.

4 jobs for 13-update-dependencies in 6 minutes (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #24564
shared-linux
build docs

00:00:20

 
  Test
passed #24565
gui shared-linux
test Linux

00:02:29

41.0%
passed #24566
gui shared-mac
test macOS

00:01:15

passed #24567
gui shared-win
test Windows

00:04:22