link to master build and codecov

Author: jscottsmith

README.md

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 # React Scroll Parallax
 
-[![npm version](https://badge.fury.io/js/react-scroll-parallax.svg)](https://badge.fury.io/js/react-scroll-parallax) [![Build Status](https://travis-ci.org/jscottsmith/react-scroll-parallax.svg?branch=dev)](https://travis-ci.org/jscottsmith/react-scroll-parallax) [![codecov](https://codecov.io/gh/jscottsmith/react-scroll-parallax/branch/dev/graph/badge.svg)](https://codecov.io/gh/jscottsmith/react-scroll-parallax)
+[![npm version](https://badge.fury.io/js/react-scroll-parallax.svg)](https://badge.fury.io/js/react-scroll-parallax) [![Build Status](https://travis-ci.org/jscottsmith/react-scroll-parallax.svg?branch=master)](https://travis-ci.org/jscottsmith/react-scroll-parallax) [![codecov](https://codecov.io/gh/jscottsmith/react-scroll-parallax/branch/master/graph/badge.svg)](https://codecov.io/gh/jscottsmith/react-scroll-parallax)
 
 Provides a React component and single passive scroll listener to add **vertical** scrolling based offsets to elements based on their position in the viewport. Works with universal (server-side rendered) React apps.