Updated Badge to match CodeCov
<a href="https://travis-ci.com/VirtualPlanetaryLaboratory/vplanet"><img src="https://travis-ci.com/VirtualPlanetaryLaboratory/vplanet.svg?token=jABaFLLgJNHTWSqkT7CM&branch=master"></a>
<a href="tests"><img src = "https://img.shields.io/badge/tests-46-darkorange.svg?style=flat"></a>
<img src = "https://img.shields.io/badge/memcheck-clean-green.svg?style=flat">
- <img src = "https://img.shields.io/badge/coverage-77%25-red.svg?style=flat">
+ <a href="https://codecov.io/gh/VirtualPlanetaryLaboratory/vplanet">
+ <img src="https://codecov.io/gh/VirtualPlanetaryLaboratory/vplanet/branch/dev/graph/badge.svg?token=3LFJQO1M6H"/>
+ </a>
</p>
### Overview
