Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/folly/commit/02a4b2002c3a4746db34a904f752fa7bd1373d4f
https://github.com/facebook/litho/commit/d8691e19e09556e1347cd74a884d4fd6b3636567
https://github.com/facebook/watchman/commit/2e3a86a7a037b3a742c21bf73eb83a6680e317a7

Reviewed By: wittgenst

fbshipit-source-id: 921da2575cf4a3be23ef91cefb4bdef7a3c878f8

facebook/wangle,facebook/wangle,facebook/wangle