Bump version to 0.3

Version 0.3 will be used on the gerrit master branch. Bumping up
to 0.3 will allow us to release another 0.2-X version to be used
on gerrit stable-3.0, if necessary.

Change-Id: I24cb53ae49d28f00cdbe98c3e277b61b66aef92d

version.bzl

diff --git a/version.bzl b/version.bzl
index 50e9692..ef5bcd0 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 = "0.2-9"
+GITILES_VERSION = "0.3"