Fixed erroneous test for blockquotes and preserveNewlines.

The problem with the test was that it expected four newlines to be present when only three lines were given. When preserveNewlines is true, three lines should be three lines, even though the result will be that the text following the block quote will be obsorbed into the blockquote.

Author: danielsnider

test/draft-to-markdown.spec.js

@@ -94,7 +94,7 @@ describe('draftToMarkdown', function () {
       expect(markdown).toEqual('> one\n> \n> blockquote\n\nHello :)');
 
       markdown = draftToMarkdown(rawObject, {preserveNewlines: true});
-      expect(markdown).toEqual('> one\n> \n> blockquote\n\nHello :)');
+      expect(markdown).toEqual('> one\n> \n> blockquote\nHello :)');
     });
   });