Update rse-gln.md

[DMadren]

Update to RSE-GLN Coordinator contact, Daniel Madren

Description

Checklist:

• I have previewed changes locally or with CircleCI (runs when PR is created)
• I have completed any content reviews, such as getting input from relevant working groups. If no, please note this and wait to post the PR to the #website channel until the content has been settled.

When you are ready for a technical review/merge, post the for the link for the PR in the US-RSE Slack (#website) to ask for reviewers.

[cosden]

Preview: https://output.circle-artifacts.com/output/job/a97dd007-762a-4ceb-b5b6-b8e126c1c853/artifacts/0/usrse.github.io/ag/rse-gln/index.html

[cosden]

Looks good! Sorry it took a while!