Bump version to 0.2-12

Change-Id: Ie9087d7696b13d4d04c19e2d29ebe2ccd807340d

version.bzl

diff --git a/version.bzl b/version.bzl
index d361e3e..6d3ce4d 100644
--- a/version.bzl
+++ b/version.bzl
@@ -4,4 +4,4 @@
 # we currently have no stable releases, we use the "build number" scheme
 # described at:
 # https://www.mojohaus.org/versions-maven-plugin/version-rules.html
-GITILES_VERSION = "0.2-11"
+GITILES_VERSION = "0.2-12"