Update README.md

README.md

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 # simple-pid
 
-![Travis](https://travis-ci.com/m-lundberg/simple-pid.svg?branch=master)
+[![Travis](https://travis-ci.com/m-lundberg/simple-pid.svg?branch=master)](https://travis-ci.com/m-lundberg/simple-pid)
 [![PyPI](https://img.shields.io/pypi/v/simple-pid.svg)](https://pypi.org/project/simple-pid/)
 [![Read the Docs](https://img.shields.io/readthedocs/simple-pid.svg)](https://simple-pid.readthedocs.io/)
-![license](https://img.shields.io/github/license/m-lundberg/simple-pid.svg)
+[![License](https://img.shields.io/github/license/m-lundberg/simple-pid.svg)](https://github.com/m-lundberg/simple-pid/blob/master/LICENSE.md)
 
 A simple and easy to use PID controller in Python. If you want a PID controller without external dependencies that just works, this is for you! The PID was designed to be robust with help from [Brett Beauregards guide](http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/).