Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Bump required Bazel version to 2.1.0

Change-Id: I7dc85c07cf171e3c2520ee9b3f4d62e1fb7904c4
diff --git a/.bazelversion b/.bazelversion
index 227cea2..7ec1d6d 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-2.0.0
+2.1.0