Bump required bazel version to 1.0.0rc2

Change-Id: I054b83b3df7d9fda5539f9e6ab43da6d2e665715

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 09d1d01..8862dba 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1,2 +1 @@
-0.29.0
-
+1.0.0rc2