Bump version to 1.3.0

The guava and soy dependency versions have been updated.

Change-Id: Ifb0b0c406b1c4cdd36193645c169c470fb5225f0

version.bzl

diff --git a/version.bzl b/version.bzl
index e4bdfca..fef692b 100644
--- a/version.bzl
+++ b/version.bzl
@@ -3,4 +3,4 @@
 # Used by :install and :deploy when talking to the destination repository.
 # Project uses semantic versioning described at:
 # https://semver.org
-GITILES_VERSION = "1.2.0"
+GITILES_VERSION = "1.3.0"