Update git submodules

* Update plugins/commit-message-length-validator from branch 'master'
  - Update default values to match 50/72 rule
    
    The 50/72 rule was laid out by tpope in 2008 (see
    www.tpope.net/node/106), and has gained wide acceptance
    in the git community. It makes sense to enforce it by
    default, since the values are configurable anyway.
    
    Change-Id: I472ddbd2caf7cd1036f8ce2953380445bca8712a
    
diff --git a/plugins/commit-message-length-validator b/plugins/commit-message-length-validator
index efdb87d..07b5f22 160000
--- a/plugins/commit-message-length-validator
+++ b/plugins/commit-message-length-validator
@@ -1 +1 @@
-Subproject commit efdb87d4e719f013bc8c673ce00cad168b00e18e
+Subproject commit 07b5f220ec6e7e08d5483c2e6248f6145d30712e