Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Bump Bazel version to 2.2.0

Change-Id: Idfb30c6cc7fdef0cb5d469a061633c890c6b0cf1

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 7ec1d6d..ccbccc3 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-2.1.0
+2.2.0