Add missing demo dependencies

Author: kitten

demo/next.config.js

@@ -2,6 +2,10 @@ const path = require('path');
 
 module.exports = {
   webpack: config => {
+    if (process.env.CONTEXT) {
+      return config;
+    }
+
     config.resolve.alias = {
       'react-live': path.resolve('../'),
       react: path.resolve('../node_modules/react'),

demo/package.json

@@ -17,6 +17,11 @@
     "module-alias": "^2.0.0",
     "next": "^5.0.0",
     "polished": "^1.0.2",
-    "styled-components": "^3.1.6"
+    "react": "^16.9.0",
+    "react-dom": "^16.9.0",
+    "react-is": "^16.9.0",
+    "react-live": "^2.1.2",
+    "styled-components": "^5.0.0-beta.8",
+    "stylis": "^3.5.4"
   }
 }