Update git submodules

* Update docs/submodules/promise from branch 'master'
  - Merge "Updated list of upstream contributions in Blazar"
  - Updated list of upstream contributions in Blazar

    Change-Id: I470de39706403dabb36912c97c5c57bfcaa5ea26
    Signed-off-by: Bertrand Souville <souville@docomolab-euro.com>

diff --git a/docs/submodules/promise b/docs/submodules/promise
index 04d5249..e081a20 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit 04d5249cca18cbd900be3fdfce6042e4cc5be9df
+Subproject commit e081a200bc12b4c23d283b1d447dbaa4d73a1228