Convert rakudo star instructions to newer format

library/rakudo-star

@@ -1,5 +1,7 @@
-# maintainer: Rob Hoelz <robAThoelz.ro> (@hoelzro)
+Maintainers: Rob Hoelz <robAThoelz.ro> (@hoelzro)
 
-2018.04:  git://github.com/perl6/docker@aff1beeb74853acb6d04c7335ef56c56f0270407
+GitRepo: https://github.com/perl6/docker
 
-latest:  git://github.com/perl6/docker@aff1beeb74853acb6d04c7335ef56c56f0270407
+Tags: latest, 2018.04
+Architectures: amd64
+GitCommit: aff1beeb74853acb6d04c7335ef56c56f0270407