Merge pull request #2824 from dmcgowan/update-version-file-2.7.1

Update version file for 2.7.1

version/version.go

@@ -8,7 +8,7 @@ var Package = "github.com/docker/distribution"
 // the latest release tag by hand, always suffixed by "+unknown". During
 // build, it will be replaced by the actual version. The value here will be
 // used if the registry is run after a go get based install.
-var Version = "v2.7.0+unknown"
+var Version = "v2.7.1+unknown"
 
 // Revision is filled with the VCS (e.g. git) revision being used to build
 // the program at linking time.