Add Travis badge to README.md

2018-09-29 23:29:45 +08:00 · 2018-09-29 23:29:45 +08:00 · 432267b83d
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+[![Build Status](https://travis-ci.org/hasufell/ghcup.svg?branch=master)](https://travis-ci.org/hasufell/ghcup)
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 # GHC up

 Installs a specified GHC version into `~/.ghcup/<ver>`,