Merge branch 'stable-3.0'

* stable-3.0:
  Bump Bazel version to 2.2.0

Change-Id: Iaef28f6ba88e4fb6b8ec3ca7d028cbb42894e039
diff --git a/.bazelversion b/.bazelversion
index 7ec1d6d..ccbccc3 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-2.1.0
+2.2.0