Update to spec v2

mariadb.yaml

@@ -1,6 +1,6 @@
 ---
 document: modulemd
-version: 1
+version: 2
 data:
     summary: MariaDB Module
     description: MariaDB is a community developed branch of MySQL.
@@ -12,10 +12,10 @@ data:
     license:
         module: [MIT]
     dependencies:
-        buildrequires:
-            platform: f28
-        requires:
-            platform: f28
+        - buildrequires:
+              platform: []
+          requires:
+              platform: []
     references:
         community: https://docs.pagure.org/modularity/
         documentation: https://github.com/container-images/mariadb/