Bump github.com/containers/storage from 1.16.5 to 1.16.6

Bumps [github.com/containers/storage](https://github.com/containers/storage) from 1.16.5 to 1.16.6.
- [Release notes](https://github.com/containers/storage/releases)
- [Changelog](https://github.com/containers/storage/blob/master/docs/containers-storage-changes.md)
- [Commits](containers/storage@v1.16.5...v1.16.6)

Signed-off-by: dependabot-preview[bot] <[email protected]>

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/containers/libtrust v0.0.0-20190913040956-14b96171aa3b
 	github.com/containers/ocicrypt v0.0.0-20190930154801-b87a4a69c741
-	github.com/containers/storage v1.16.5
+	github.com/containers/storage v1.16.6
 	github.com/docker/distribution v0.0.0-20170817175659-5f6282db7d65
 	github.com/docker/docker v0.0.0-20180522102801-da99009bbb11
 	github.com/docker/docker-credential-helpers v0.6.3

go.sum

@@ -32,6 +32,8 @@ github.com/containers/storage v1.16.3 h1:bctiz1I+0TIivtXbrVmy02ZYlOA+IjKIJMzAMTB
 github.com/containers/storage v1.16.3/go.mod h1:dNTv0+BaebIAOGgH34dPtwGPR+Km2fObcfOlFxYFwA0=
 github.com/containers/storage v1.16.5 h1:eHeWEhUEWX3VMIG1Vn1rEjfRoLHUQev3cwtA5zd89wk=
 github.com/containers/storage v1.16.5/go.mod h1:SdysZeLKJOvfHYysUWg9OZUC3gdZWi5b2b7NC18VpPE=
+github.com/containers/storage v1.16.6 h1:G/thPW/LVRwJpQvve1V4DQXVZpxzSltC2fzc3yTEdi8=
+github.com/containers/storage v1.16.6/go.mod h1:Fws4I+U+C4DmJxDbBs1z9SKk50DzN4LtA+g1b+FmkTY=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=