jscs v1.13.0 reports "Unexpected reserved word" for "import" keyword.

Contents of `.jscsrc` file is:

``` json
{}
```

(empty for simplicity of example)

Have a file `test.js` with:

``` javascript
import angular from 'angular';
```

`./node_modules/.bin/jscs --esnext test.js` reports:

``` bash
Unexpected reserved word at test.js :
     1 |import angular from 'angular';
---------^
     2 |
```

My current fix/workaround is to freeze on version 1.12.0.
