httplib2: Update httplib2 to 0.13.1

Upgrade pip package for httplib2 to 0.13.1, which is the latest release
of the package, in an attempt to resolve issues with the latest version
of python with Bionic.

Bug: chromium:989683
Change-Id: I0cada2c7121462d480c562074bd96081b6481782
(cherry picked from commit a070aaec477f1a6d192d70b0b2491d1184424aba)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra_virtualenv/+/2123743
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/pip_packages/httplib2-0.13.1-py2-none-any.whl b/pip_packages/httplib2-0.13.1-py2-none-any.whl
new file mode 100644
index 0000000..f02be93
--- /dev/null
+++ b/pip_packages/httplib2-0.13.1-py2-none-any.whl
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