Update pybind11 submodule to v2.0

dean0x7d · dean0x7d · commit a3a63d72889d · 2017-01-01T20:37:07.000+01:00
diff --git a/pybind11 b/pybind11
@@ -1 +1 @@
-Subproject commit 19d95ef09a384d6631308161ead24e5a230c9bf8
+Subproject commit e33ef9c20d36fe760792c61ccc95ecf1b42cf81d
