Adding @spier to the codeowners

Author: lenucksi

.github/CODEOWNERS

@@ -8,7 +8,7 @@
 # the repo. Unless a later match takes precedence,
 # @global-owner1 and @global-owner2 will be requested for
 # review when someone opens a pull request.
-*       @lenucksi @nyeates @gruetter @NewMexicoKid @cewilliams
+*       @lenucksi @nyeates @gruetter @NewMexicoKid @cewilliams @spier
 
 # Order is important; the last matching pattern takes the most
 # precedence. When someone opens a pull request that only