Include doc8 in doc.txt requirements file.

rfoliva · rfoliva · commit 78c43ead4d77 · 2018-10-06T02:45:30.000-04:00
diff --git a/requirements/doc.txt b/requirements/doc.txt
@@ -5,3 +5,4 @@ alagitpull==0.0.21
 releases==1.6.1
 aafigure==0.6
 sphinxcontrib-napoleon==0.7
+doc8==0.8.0
