Add option to enforce certain line endings (#5327)

docs/api.md

@@ -51,6 +51,7 @@ prettier.resolveConfig(filePath).then(options => {
 
 If `options.editorconfig` is `true` and an [`.editorconfig` file](http://editorconfig.org/) is in your project, Prettier will parse it and convert its properties to the corresponding prettier configuration. This configuration will be overridden by `.prettierrc`, etc. Currently, the following EditorConfig properties are supported:
 
+- `end_of_line`
 - `indent_style`
 - `indent_size`/`tab_width`
 - `max_line_length`