Include docs in package.
diff --git a/MANIFEST.in b/MANIFEST.in
index 8b3684f..b16d610 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,4 +3,7 @@
 include MANIFEST.in
 include README.rst
 
+recursive-include docs *
+prune docs/_build
+
 recursive-include tests *.py