Move demo link to the top of the README (#370)

Co-authored-by: Mark Amery <markrobertamery@gmail.com>

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://secure.travis-ci.org/kpdecker/jsdiff.svg)](http://travis-ci.org/kpdecker/jsdiff)
 [![Sauce Test Status](https://saucelabs.com/buildstatus/jsdiff)](https://saucelabs.com/u/jsdiff)
 
-A JavaScript text differencing implementation.
+A JavaScript text differencing implementation. Try it out in the **[online demo](https://kpdecker.github.io/jsdiff)**.
 
 Based on the algorithm proposed in
 ["An O(ND) Difference Algorithm and its Variations" (Myers, 1986)](http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.4.6927).
@@ -198,8 +198,6 @@ Open the above .html file in a browser and you should see
 
 <img src="images/web_example.png" alt="Node Example">
 
-**[Full online demo](https://kpdecker.github.io/jsdiff)**
-
 ## Compatibility
 
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/jsdiff.svg)](https://saucelabs.com/u/jsdiff)