Ordering is important, it turns out.

Lukasa · Lukasa · commit 755ee8bc3ef3 · 2016-06-08T12:06:45.000+01:00
diff --git a/.travis/install.sh b/.travis/install.sh
@@ -46,7 +46,7 @@ if [[ "$HYPER_FAST_PARSE" = true ]]; then
     pip install pycohttpparser~=1.0
 fi
 
-pip install .
 pip install -U setuptools
+pip install .
 pip install -r test_requirements.txt
 pip install flake8
