Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Bump Bazel version to 2.2.0

Change-Id: I90d6f74a0ef796d0264957570e0c8c1eec2b1126
diff --git a/.bazelversion b/.bazelversion
index 7ec1d6d..ccbccc3 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-2.1.0
+2.2.0