Merge branch 'stable-3.1'

* stable-3.1:
  Upgrade bazlets to latest stable-3.1
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14

Change-Id: I38077bf5f46d7531d14d5a23605eefc6a9bac01c

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 8667465..7e0aae3 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "8c8df720486ebe0b60adccd0eceb1c8122edaf58",
+    commit = "968b97fa03a9d2afd760f2e8ede3d5643da390d2",
     #local_path = "/home/<user>/projects/bazlets",
 )