Fix up rakudo star recipe formatting

Thanks to @tianon++ for helping with the fix!

library/rakudo-star

@@ -1,7 +1,6 @@
 Maintainers: Rob Hoelz <robAThoelz.ro> (@hoelzro)
-
 GitRepo: https://github.com/perl6/docker
-
-Tags: latest, 2018.04
 Architectures: amd64, arm64v8
 GitCommit: aff1beeb74853acb6d04c7335ef56c56f0270407
+
+Tags: latest, 2018.04