Ensure we have a modern pip

For some utterly moronic reason, something somewhere in the
stack (e.g. tox or pip) keeps insisting on installing an ancient pip
version 7 which fails in other depressing ways, so force it to not be
idiotic.

*rage*

1 files changed, 1 insertions, 0 deletions

diff --git a/requirements.txt b/requirements.txt
index dc78b65..a78b6cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
+pip >= 10.0.1
 pygit2 >= 0.27.0
 flask