Update readme

Removes build status badge

README.md

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 argo is part of [Project Electron](https://github.com/RockefellerArchiveCenter/project_electron), an initiative to build sustainable, open and user-centered infrastructure for the archival management of digital records at the [Rockefeller Archive Center](http://rockarch.org/).
 
-[![Build Status](https://app.travis-ci.com/RockefellerArchiveCenter/argo.svg?branch=base)](https://app.travis-ci.com/RockefellerArchiveCenter/argo)
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 ## Setup
 
 Install [git](https://git-scm.com/) and clone the repository