Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Updated from global requirements

    Change-Id: Ib6c90b7a0fc5f23a9882c3ca4cc4d3031cebe5b9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 390d31e..20b1d60 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 390d31e3a6eaa0968474d19d71ec804d0c6c071a
+Subproject commit 20b1d60dc05690cd410ec763efb336f349f649f9