Update git submodules

* Update docs/submodules/barometer from branch 'stable/danube'
  - release notes: update for danube 3.0

    Change-Id: Idb226781eef8ac83d2a73ac3698fb43fda2c76e6
    Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 2d91c60..88591e7 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 2d91c6022a2d772acaabc21d3bbd7f26d9152d71
+Subproject commit 88591e782d3a57c25aff326cd844bc6030c0ed38