Merge branch 'stable-3.1'

* stable-3.1:
  Upgrade bazlets to latest stable-3.1 to build with 3.1.8 API
  Upgrade bazlets to latest stable-3.0 to build with 3.0.12 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.22 API

Change-Id: I4e4265eb5dd6f91ad7d7c764558d7fe431a998d0

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index c684ab0..600d4d9 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "3f9dadc615dc4053369a42d9ada37dafd8d4763c",
+    commit = "74f9d8e76d5014d218ae6fe55127a5288c9a32c3",
     #local_path = "/home/<user>/projects/bazlets",
 )