Bump bazel version to 1.0.0

Change-Id: I0216105d43166ca737c0bfcc05937ce3c1027765

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 25939d3..3eefcb9 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-0.29.1
+1.0.0