Merge pull request #1520 from RichardScothern/registry-v2.3.1

Registry release v2.3.1

library/registry

@@ -3,6 +3,6 @@
 # maintainer: Richard Scothern <[email protected]> (@RichardScothern)
 # maintainer: Aaron Lehmann <[email protected]> (@aaronlehmann)
 
-2: git://github.com/docker/distribution-library-image@93b4a90b491342c3906980192826adeabe59a34c
-2.3: git://github.com/docker/distribution-library-image@93b4a90b491342c3906980192826adeabe59a34c
-2.3.0: git://github.com/docker/distribution-library-image@93b4a90b491342c3906980192826adeabe59a34c
+2: git://github.com/docker/distribution-library-image@b518c35ff6498b007bfccb13d03519d188125689
+2.3: git://github.com/docker/distribution-library-image@b518c35ff6498b007bfccb13d03519d188125689
+2.3.1: git://github.com/docker/distribution-library-image@b518c35ff6498b007bfccb13d03519d188125689