Bump bazel version to 2.0.0

Also bump bazlets to the latest master revision.

Change-Id: Ia984bc9250b8c2a8dc03458e2c910fadb1ef6149

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 26aaba0..227cea2 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-1.2.0
+2.0.0

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index afff638..be33209 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -28,7 +28,7 @@
 load("//tools:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "bf900bbe58f7a7802799d6d6477567b05ab2f399",
+    commit = "ed210c9f7132b2e1b21d993b85bc55e9623ea4e2",
     # local_path = "/home/<user>/projects/bazlets",
 )