README: point to travis-ci.com
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-# Gonum [](https://www.travis-ci.org/gonum/gonum/branches) [](https://ci.appveyor.com/project/Gonum/gonum/branch/master) [](https://codecov.io/gh/gonum/gonum) [](https://coveralls.io/github/gonum/gonum?branch=master) [](https://godoc.org/gonum.org/v1/gonum) [](https://goreportcard.com/report/github.com/gonum/gonum) [](https://github.com/emersion/stability-badges#unstable)
+# Gonum [](https://www.travis-ci.com/gonum/gonum/branches) [](https://ci.appveyor.com/project/Gonum/gonum/branch/master) [](https://codecov.io/gh/gonum/gonum) [](https://coveralls.io/github/gonum/gonum?branch=master) [](https://godoc.org/gonum.org/v1/gonum) [](https://goreportcard.com/report/github.com/gonum/gonum) [](https://github.com/emersion/stability-badges#unstable)
## Installation