Fix TravisCI badge
#
![Goa logo](https://goa.design/img/goa-logo.svg "Goa")
+
Goa is a framework for building micro-services and APIs in Go using a unique
design-first approach.
---
-[![Build Status](https://travis-ci.org/goadesign/goa.svg?branch=v2)](https://travis-ci.org/goadesign/goa)
+[![Build Status](https://travis-ci.org/goadesign/goa.svg?branch=v3)](https://travis-ci.org/goadesign/goa)
[![Windows Build status](https://ci.appveyor.com/api/projects/status/vixp37loj5i6qmaf/branch/v3?svg=true)](https://ci.appveyor.com/project/RaphaelSimon/goa-oqtis/branch/master)
[![Sourcegraph](https://sourcegraph.com/github.com/goadesign/goa/-/badge.svg)](https://sourcegraph.com/github.com/goadesign/goa?badge)
[![Godoc](https://godoc.org/goa.design/goa?status.svg)](https://godoc.org/goa.design/goa)
