Update command to fetch latest commit for issue template (#1342)

Signed-off-by: Matthew Peveler <[email protected]>

.github/ISSUE_TEMPLATE/bug.md

@@ -18,5 +18,5 @@ If applicable, add screenshots to help explain your problem.
  - Browser [e.g. chrome, safari]
  - Version [e.g. 22]
 
-**Last upstream Slate commit (run `git log --author="Robert Lord" | head -n 1`):**
+**Last upstream Slate commit (run `git log --author="\(Robert Lord\)\|\(Matthew Peveler\)\|\(Mike Ralphson\)" | head -n 1`):**
 Put the commit hash here