Exclude build docs from sdist.

Carreau · Carreau · commit e426a64ee0e0 · 2018-01-03T14:25:48.000+01:00
This shrinks the sdist from 2MB to ~250KB... just realized that after
uploading 5.2.1 took way too long. Apparently 5.2.0 alsho shipped built
docs.
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -5,6 +5,7 @@ include README.md
 # Documentation
 graft docs
 exclude docs/\#*
+exclude docs/_*
 
 # Examples
 graft examples
