Exclude s-g generated files from flake8 check.

anntzer · anntzer · commit b28bbbd11d22 · 2019-09-07T12:09:58.000+02:00
They're already being checked (with a bunch of exclusions) anyways, and
this avoids a bunch of spurious warnings when running flake8 from a
checkout with the docs built.
diff --git a/.flake8 b/.flake8
@@ -19,6 +19,8 @@ ignore =
 exclude =
     .git
     build
+    doc/gallery
+    doc/tutorials
     # External files.
     versioneer.py
     tools/gh_api.py
