require disappears

Code:

```js
import raf from 'raf'

raf()
```

Where `node_modules/raf/index.js` starts with:

```js
var now = require('performance-now')
  , root = typeof window === 'undefined' ? global : window
```

Rollup config:

```js
import commonjs from 'rollup-plugin-commonjs'
import nodeResolve from 'rollup-plugin-node-resolve'

export default {
  entry: 'main.js',
  dest: 'bundle.js',
  format: 'iife',
  plugins: [
    nodeResolve(),
    commonjs()
  ]
}
```

Versions:

```json
  "devDependencies": {
    "rollup": "^0.41.5",
    "rollup-plugin-commonjs": "^8.0.1",
    "rollup-plugin-node-resolve": "^2.0.0"
  }
```

Output of `rollup -c rollup.config.js`:

```
🚨   Unexpected token
node_modules/raf/index.js (6:2)
4: 
5: var 
6:   , root = typeof window === 'undefined' ? commonjsHelpers.commonjsGlobal : window
     ^
7:   , vendors = ['moz', 'webkit']
8:   , suffix = 'AnimationFrame'
```

So it looks like it's stripping out the `require('performance-now')` but neglecting to remove the comma that follows it?

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require disappears #181

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require disappears #181

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