remove Travis-CI link

README.md

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 # LK
-[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause) [![TravisCI](https://travis-ci.org/NREL/lk.svg?branch=develop)](https://travis-ci.org/NREL/lk)
+[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
 LK is a scripting language originally developed for the National Renewable Energy Laboratory's [System Advisor Model™ (SAM™)](https://sam.nrel.gov). LK is designed to be small, fast, and easily embedded in other applications, and provides a way for users to to extend an application's built-in functionality.