Add graft for flatbuffers

Hanbin Hu · Hanbin Hu · commit b14db060fb97 · 2021-04-11T14:23:28.000-07:00
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -3,4 +3,5 @@ recursive-include * *.h *.hpp *.cc *.md *.rst
 include README.rst LICENSE requirements.txt
 prune .eggs
 
-graft third_party/boost
+graft third_party/boost
+graft third_party/flatbuffers
