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;
   }