Have Travis install requirements for sphinx

diff --git a/.travis.yml b/.travis.yml
index b16d061da13541dcad3760baefaacd7ad2568a56..61d0d8d910c5e142b78a3f00e3770cefda5f8fc2 100755 (executable)
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,6 +29,7 @@ deploy:
       tags: true
 
 install:
+  - pip install -r requirements.txt
   - pip install pylint circuitpython-build-tools Sphinx sphinx-rtd-theme
 
 script: