docs: fix typo on docs ("gzpipped" -> "gzipped") (#631)

docs/index.html

@@ -25,7 +25,7 @@ <h2>Easily position tooltips, popovers or anything<br />
 								</p>
 
 								<p>
-									Popper.js is just <strong>~6KB</strong> minified and gzpipped, zero dependencies.<br />
+									Popper.js is just <strong>~6KB</strong> minified and gzipped, zero dependencies.<br />
 									Its code base is in <strong>ES6</strong> and is <strong>automatically tested</strong> against several browsers.<br />
 									If this is not enough, it plays super nicely with
 									<a href="https://github.com/FezVrasta/popper.js/#react-vuejs-angular-angularjs-emberjs-etc-integration" target="_blank"><strong>React</strong>, <strong>AngularJS</strong> and more</a>!