RC review: Lock test file with commit instead of master

[rcaneill]

I believe that providing the exact version of the test file may avoid problems in the future if the upstream Coastal_Ecological_Indicators is updated

[jbousquin]

I don't disagree, but my preference is to keep it standard for all the example files in this package and point to the main/master rather than the commit. (1) I'm the owner/maintainer of the other repo and don't anticipate changes to this file, and (2) I've seen others and been burned myself by github urls changing - if that happens generally I'm more aware, my concern would be that something would change for commits and being non-standard it would be harder to detect.

[rcaneill]

Ok sounds fair, I close this PR