Fix reference to bigrails in COC (#8)

Author: Alex Evanczuk

CODE_OF_CONDUCT.md

@@ -59,7 +59,7 @@ representative at an online or offline event.
 ## Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported to the community leaders responsible for enforcement at bigrails@gusto.com.
+reported to the community leaders responsible for enforcement at rubyatscale@gusto.com.
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the