Merge pull request ipfs#6366 from ipfs/feat/release-v0.4.21-rc2

release: go-ipfs 0.4.21-rc2

Author: Stebalien

version.go

@@ -4,6 +4,6 @@ package ipfs
 var CurrentCommit string
 
 // CurrentVersionNumber is the current application's version literal
-const CurrentVersionNumber = "0.4.21-rc1"
+const CurrentVersionNumber = "0.4.21-rc2"
 
 const ApiVersion = "/go-ipfs/" + CurrentVersionNumber + "/"