Use crlf when copying on Windows

Fixes #737

src/SelectionManager.ts

@@ -233,7 +233,7 @@ export class SelectionManager extends EventEmitter {
  // and joining the array into a multi-line string.
  const formattedResult = result.map(line => {
  return line.replace(ALL_NON_BREAKING_SPACE_REGEX, ' ');
- }).join('\n');
+ }).join(Browser.isMSWindows ? '\r\n' : '\n');
 
  return formattedResult;
  }