Spell runslow correctly

tests/test_hocrtransform.py

@@ -17,7 +17,6 @@
 
 import re
 from io import StringIO
-from pathlib import Path
 
 import pytest
 from pdfminer.converter import TextConverter
@@ -70,7 +69,7 @@ def test_mono_image(blank_hocr, outdir):
     check_pdf(str(outdir / 'mono.pdf'))
 
 
-@pytest.runslow
+@pytest.mark.slow
 def test_hocrtransform_matches_sandwich(resources, outdir):
     check_ocrmypdf(resources / 'ccitt.pdf', outdir / 'hocr.pdf', '--pdf-renderer=hocr')
     check_ocrmypdf(