Merge branch 'stable-3.1'

* stable-3.1:
  Bump Bazel version to 3.4.1
  Upgrade bazlets to latest stable-2.16

Change-Id: I0a0e57c90b81c97f7a497d18157954a0e8b85c68
tree: 5eb51c9c06cdea7c35207d081d995d0f3822e4c7
  1. .settings/
  2. src/
  3. .bazelignore
  4. .bazelversion
  5. bazlets.bzl
  6. BUILD
  7. LICENSE