fix shield godoc badge
<a href="https://spacemesh.io"><img src="https://img.shields.io/badge/madeby-spacemeshos-blue.svg"/></a>
[![Go Report Card](https://goreportcard.com/badge/github.com/spacemeshos/go-spacemesh)](https://goreportcard.com/report/github.com/spacemeshos/go-spacemesh)
<a href="https://travis-ci.org/spacemeshos/go-spacemesh"><img src="https://api.travis-ci.org/spacemeshos/go-spacemesh.svg?branch=master"/></a>
-<a hred="https://godoc.org/github.com/spacemeshos/go-spacemesh"><img src="https://img.shields.io/badge/godoc-LGTM-blue.svg"/></a>
+<a href="https://godoc.org/github.com/spacemeshos/go-spacemesh"><img src="https://img.shields.io/badge/godoc-LGTM-blue.svg"/></a>
</p>
## go-spacemesh
