update link to doc
[![Build Status](https://travis-ci.org/hungpham2511/toppra.svg?branch=master)](https://travis-ci.org/hungpham2511/toppra) [![Coverage Status](https://coveralls.io/repos/github/hungpham2511/toppra/badge.svg?branch=master)](https://coveralls.io/github/hungpham2511/toppra?branch=master)
-**Documentation and tutorials** are available at (https://hungpham2511.github.io/toppra/).
+**Documentation and tutorials** are available at (https://toppra.readthedocs.io/en/latest/index.html).
TOPP-RA is a library for computing the time-optimal path parametrization for robots subject to kinematic and dynamic constraints.
In general, given the inputs:
