adjust COC and add to Rbuildignore

Author: the-mayer

.Rbuildignore

@@ -8,3 +8,4 @@
 ^_pkgdown\.yml$
 ^docs$
 ^pkgdown$
+^CODE_OF_CONDUCT\.md$

.github/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 [email protected]. 
+reported to the community leaders responsible for enforcement at [email protected]. 
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the