fixed path of cytoscape in test file

cytoscape.js does not exist in node modules, only cytoscape.min.js

Author: kinimesi

test/index.html

@@ -10,7 +10,7 @@
   <script src="../node_modules/chai/chai.js"></script>
   <script src="../node_modules/react/umd/react.development.js"></script>
   <script src="../node_modules/react-dom/umd/react-dom.development.js"></script>
-  <script src="../node_modules/cytoscape/dist/cytoscape.js"></script>
+  <script src="../node_modules/cytoscape/dist/cytoscape.min.js"></script>
   <script src="../node_modules/immutable/dist/immutable.js"></script>
   <script src="../node_modules/prop-types/prop-types.js"></script>
   <script src="../dist/react-cytoscape.js"></script>
@@ -35,4 +35,4 @@
   </script>
 </body>
 
-</html>
+</html>