the module name listed in go.mod was for ugorji/go instead of

hashicorp/go-msgpack. this caused errors when using this module:
```
go: github.com/hashicorp/[email protected]: parsing go.mod: unexpected module path "github.com/ugorji/go"
```

this change is consistent with the go.mod contents on the master branch
of hashicorp/go-msgpack

Author: cgbaker

go.mod

@@ -1,4 +1,4 @@
-module github.com/ugorji/go
+module github.com/hashicorp/go-msgpack
 
 go 1.13