Merge branch 'stable-5.7'

* stable-5.7:
  Remove double blank from sentence start
  Bump Bazel version to 3.0.0
  Scan through all merged reftables for max/min update indices

Change-Id: Idee792c6e65ca3fb283dba850f17d6554aaa1fa7
diff --git a/.bazelversion b/.bazelversion
index ccbccc3..4a36342 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-2.2.0
+3.0.0