Updating dependency github.com/coreos/pkg to version 97fdf19

Author: dims

go.mod

@@ -234,7 +234,7 @@ replace (
 	github.com/coreos/go-oidc => github.com/coreos/go-oidc v2.1.0+incompatible
 	github.com/coreos/go-semver => github.com/coreos/go-semver v0.3.0
 	github.com/coreos/go-systemd => github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
-	github.com/coreos/pkg => github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea
+	github.com/coreos/pkg => github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea // 97fdf19511ea is the SHA for git tag v4
 	github.com/cpuguy83/go-md2man => github.com/cpuguy83/go-md2man v1.0.10
 	github.com/creack/pty => github.com/creack/pty v1.1.7
 	github.com/cyphar/filepath-securejoin => github.com/cyphar/filepath-securejoin v0.2.2