Exercise retrieval updates#13

Merged

cmccandless merged 5 commits intoexercism:masterfrom

BethanyG:exercise-retrieval-updates

Nov 11, 2020

Commits on Nov 9, 2020

Added Corey and Bethany as codeowners for repo.
BethanyG
committed

Commits on Nov 10, 2020

Added code to get exercise file name from config.json OR compose it from the passed in slug.
BethanyG
committed
Altered SLUG_RE to include an uderscore as part of a valid slug pattern.
BethanyG
committed

Commits on Nov 11, 2020