setup: bump major version

We don't keep this up-to-date in general, but might as well keep
the major version in sync.

Change-Id: I20908005b3b393d384da0ef9342d7c9d094550cb
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/299622
Reviewed-by: Michael Mortensen <mmortensen@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
diff --git a/setup.py b/setup.py
index 77b1435..17aeae2 100755
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
 # https://packaging.python.org/tutorials/packaging-projects/
 setuptools.setup(
     name='repo',
-    version='1.13.8',
+    version='2',
     maintainer='Various',
     maintainer_email='repo-discuss@googlegroups.com',
     description='Repo helps manage many Git repositories',