Update history.md

[raynamharris]

PR Checklist

• [x] Release label added
• [x] PR category label added
• [x] PR mergeable
• [x] Clean build logs
• [x] Linked related issues #532

PR Description

Adds April and May Introduction to R Workshops and the iHMP workshop

Preview link

https://cfde-training-and-engagement--533.com.readthedocs.build/en/533/

Review format

Please check typos and links

Timeline

No rush :)

[github-actions[bot]]

Reviewer Checklist

• [ ] spelling and grammar
• [ ] successful run of all installation and code chunks
• [ ] sufficient explanation and details for the tutorial content
• [ ] code syntax and naming convention
• [ ] adherence of tutorial format to style guide
• [ ] functional links (inter and intra)
• [ ] accessible hyperlink text

[raynamharris]

Looks good, link works :)

[raynamharris]

ready for review

[jeremywalter]

March 23rd link is 404

[raynamharris]

thanks @jeremywalter fixed the link