Update README.md

README.md

@@ -5,7 +5,7 @@ unit-api
 [![Reference Status](https://www.versioneye.com/java/javax.measure:unit-api/reference_badge.svg?style=flat)](https://www.versioneye.com/java/javax.measure:unit-api/references)
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 [![Build Status](https://drone.io/github.com/unitsofmeasurement/unit-api/status.png)](https://drone.io/github.com/unitsofmeasurement/unit-api/latest)
-[![Coverage Status](https://coveralls.io/repos/github/unitsofmeasurement/unit-api/badge.svg?branch=master)](https://coveralls.io/github/unitsofmeasurement/unit-api?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/unitsofmeasurement/unit-api/badge.svg)](https://coveralls.io/github/unitsofmeasurement/unit-api)
 [![License](http://img.shields.io/badge/license-BSD3-blue.svg?style=flat-square)](http://opensource.org/licenses/BSD-3-Clause)
 [![Stack Overflow](http://img.shields.io/badge/stack%20overflow-uom-4183C4.svg)](http://stackoverflow.com/questions/tagged/units-of-measurement)
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