Merge pull request #264 from awanlin/topic/add-codeowners

Updated `CODEOWNERS`

Author: squid-ney

.github/CODEOWNERS

@@ -4,4 +4,4 @@
 # The last matching pattern takes precedence.
 # https://help.github.com/articles/about-codeowners/
 
-*         @backstage/techdocs-core
+*         @backstage/techdocs-maintainers @awanlin