Add SMEs for Go authN topics

Author: scottaddie

CODEOWNERS

@@ -25,6 +25,7 @@
 /articles/typespect/ @diberry
 
 # Azure SDK authentication topics
-/articles/java/sdk/authentication/ @scottaddie @g2vinay @billwert
-/articles/javascript/sdk/authentication/ @scottaddie @KarishmaGhiya @minhanh-phan @maorleger
-/articles/python/sdk/authentication/ @scottaddie @pvaneck @xiangyan99
+/articles/go/sdk/authentication/            @scottaddie @chlowell
+/articles/java/sdk/authentication/          @scottaddie @g2vinay @billwert
+/articles/javascript/sdk/authentication/    @scottaddie @KarishmaGhiya @minhanh-phan @maorleger
+/articles/python/sdk/authentication/        @scottaddie @pvaneck @xiangyan99