Change readme badge to Github Actions (qiskit-community#1204)

README.md

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 # Qiskit Aqua
 
-[![License](https://img.shields.io/github/license/Qiskit/qiskit-aqua.svg?style=popout-square)](https://opensource.org/licenses/Apache-2.0)[![Build Status](https://img.shields.io/travis/Qiskit/qiskit-aqua/master.svg?style=popout-square)](https://travis-ci.org/Qiskit/qiskit-aqua)[![](https://img.shields.io/github/release/Qiskit/qiskit-aqua.svg?style=popout-square)](https://github.com/Qiskit/qiskit-aqua/releases)[![](https://img.shields.io/pypi/dm/qiskit-aqua.svg?style=popout-square)](https://pypi.org/project/qiskit-aqua/)[![Coverage Status](https://coveralls.io/repos/github/Qiskit/qiskit-aqua/badge.svg?branch=master)](https://coveralls.io/github/Qiskit/qiskit-aqua?branch=master)
+[![License](https://img.shields.io/github/license/Qiskit/qiskit-aqua.svg?style=popout-square)](https://opensource.org/licenses/Apache-2.0)[![Build Status](https://github.com/Qiskit/qiskit-aqua/workflows/Aqua%20Unit%20Tests/badge.svg?branch=master)](https://github.com/Qiskit/qiskit-aqua/actions?query=workflow%3A"Aqua%20Unit%20Tests"+branch%3Amaster+event%3Apush)[![](https://img.shields.io/github/release/Qiskit/qiskit-aqua.svg?style=popout-square)](https://github.com/Qiskit/qiskit-aqua/releases)[![](https://img.shields.io/pypi/dm/qiskit-aqua.svg?style=popout-square)](https://pypi.org/project/qiskit-aqua/)[![Coverage Status](https://coveralls.io/repos/github/Qiskit/qiskit-aqua/badge.svg?branch=master)](https://coveralls.io/github/Qiskit/qiskit-aqua?branch=master)
 
 **Qiskit** is an open-source framework for working with noisy quantum computers at the level of
 pulses, circuits, and algorithms.