Use os.EOL instead of own logic for line endings

Author: GabrielCastro

lib/index.js

@@ -140,11 +140,7 @@ function getSpecificationVersion() {
  * @returns {String}
  */
 function detectLineEnding() {
-    if ( os.platform() === 'win32' )
-        return '\r\n';
-    if ( os.platform() === 'darwin' )
-        return '\r';
-    return '\n';
+    return os.EOL;
 }
 
 /**