Merge branch 'dev' of https://github.com/dcloudio/uni-app into nvue-dev

# Conflicts:
#	packages/uni-h5/dist/index.umd.min.js
#	packages/uni-h5/package.json

packages/uni-h5/dist/demo.html

-<meta charset="utf-8">
-<title>index demo</title>
-<script src="./index.umd.js"></script>
-
-<link rel="stylesheet" href="./index.css">
-
-
-<script>
-console.log(index)
-</script>

postcss.config.js

 module.exports = {
   plugins: [
-    require('autoprefixer')({ browsers: ['iOS >= 8', 'Android >= 4'] })
+    require('autoprefixer')({ overrideBrowserslist: ['iOS >= 8', 'Android >= 4'] })
   ]
 }