Add maerteijn as member (#18)

Author: tim-schilling

terraform/production/org.tfvars

@@ -17,6 +17,7 @@ members = [
   "pfouque",
   "priyapahwa",
   "testSchilling",
+  "maerteijn",
 ]
 
 organization_teams = {
@@ -53,4 +54,4 @@ organization_secrets = {
   #       description = "GPG Passphrase used to encrypt plan.out files"
   #       visibility  = "all"
   #     }
-}
+}