rollup-plugin-postcss is not work with rollup-plugin-vue

```
when i note Postcss packaged the same code css.
no rem in my dist file
```
```javascript
import path from 'path';
// import { terser } from 'rollup-plugin-terser';
import Resolve from 'rollup-plugin-node-resolve';
import Commonjs from 'rollup-plugin-commonjs';
import Babel from 'rollup-plugin-babel';
import VuePlugin from 'rollup-plugin-vue';
import Postcss from 'rollup-plugin-postcss';
import autoprefixer from 'autoprefixer';
import pxtorem from 'postcss-pxtorem';

export default {
input: 'src/index.js',
output: {
file: path.resolve(__dirname, './lib', 'index.js'),
format: 'cjs',
name: 'call-app'
},
external: ['vue', 'callapp-lib'],
plugins: [
// terser()
Postcss({
plugins: [
autoprefixer({
browsers: ['Android >= 4.0', 'iOS >= 7']
}),
pxtorem({
rootValue: 37.5,
propList: ['*']
})
],
sourceMap: false,
extensions: ['.css', '.less']
}),
VuePlugin(),
Babel({
runtimeHelpers: true,
// sourceMap: false,
extensions: ['.js', '.jsx', '.es6', '.es', '.mjs', '.vue']
}),
Resolve(),
Commonjs()
]
};
```