Merge pull request #292 from ktock/prepare-v0.5.0

Preparation for v0.5.0

Author: AkihiroSuda

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/containerd/containerd v1.5.0-beta.4
 	github.com/containerd/continuity v0.0.0-20210208174643-50096c924a4e
 	github.com/containerd/go-cni v1.0.1
-	github.com/containerd/stargz-snapshotter/estargz v0.4.1
+	github.com/containerd/stargz-snapshotter/estargz v0.5.0
 	github.com/coreos/go-systemd/v22 v22.1.0
 	github.com/docker/cli v0.0.0-20191017083524-a8ff7f821017
 	github.com/docker/docker v17.12.0-ce-rc1.0.20200730172259-9f28837c1d93+incompatible // indirect