Add Dan and Matthew as additional editors. (#22)

Co-authored-by: Matthew Tylee Atkinson <[email protected]>

Author: jyasskin

index.bs

@@ -6,6 +6,8 @@ Status: NOTE-ED
 Group: tag
 Repository: w3ctag/explainer-explainer
 URL: https://w3ctag.github.io/explainer-explainer/
+Editor: Daniel Appelquist, w3cid 35086, Invited Expert
+Editor: Matthew Tylee Atkinson, w3cid 68793, Samsung https://www.samsung.com
 Editor: Jeffrey Yasskin, w3cid 72192, Google https://google.com, [email protected]
 Complain About: accidental-2119 yes, missing-example-ids yes
 Markup Shorthands: markdown yes, css no