travis: use pyflakes master
Needed since the latest release does not support Python 3.8 but commits
since then do.
@@ -8,7 +8,7 @@ python:
# currently only checking basic things like syntax
# remind me to add a requirements.txt later
install:
- - pip install pyflakes
+ - pip install https://github.com/PyCQA/pyflakes/archive/master.zip
script:
- pyflakes .
