Surpress flake8 warnings on poppler backend

Author: bosd

camelot/backends/poppler_backend.py

@@ -10,7 +10,7 @@
 
 import os
 import shutil
-import subprocess
+import subprocess  # noqa
 import sys
 
 from camelot.backends.base import ConversionBackend
@@ -49,7 +49,9 @@ def convert(self, pdf_path: str, png_path: str, resolution: int = 300) -> None:
 
         try:
             subprocess.check_output(
-                " ".join(pdftopng_command), stderr=subprocess.STDOUT, shell=False
+                " ".join(pdftopng_command),
+                stderr=subprocess.STDOUT,
+                shell=False,  # noqa
             )
         except subprocess.CalledProcessError as e:
             raise ValueError(e.output) from e