Bump to version v0.2.2

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

version.go

diff --git a/version.go b/version.go
index ad932ba..ac5130b 100644
--- a/version.go
+++ b/version.go
@@ -1,5 +1,5 @@
 package containerd
 
-const Version = "0.1.0"
+const Version = "0.2.2"
 
 var GitCommit = ""