fix broken tests for latest wkhtmltopdf version

Author: JazzCore

tests/fixtures/example2.css

@@ -1 +1 @@
-a { color: blue; }
+a { color: blue; }

tests/pdfkit-tests.py

@@ -327,7 +327,7 @@ def test_raise_error_if_bad_wkhtmltopdf_option(self):
             r.to_pdf()
 
         raised_exception = cm.exception
-        self.assertRegexpMatches(str(raised_exception), '^wkhtmltopdf exited with non-zero code 1. error:\nUnknown long argument --bad-option\n')
+        self.assertRegexpMatches(str(raised_exception), '^wkhtmltopdf exited with non-zero code 1. error:\nUnknown long argument --bad-option\r?\n')
 
 if __name__ == "__main__":
     unittest.main()