Comment out: pip install -r requirements.txt

.travis.yml

@@ -7,7 +7,7 @@ matrix:
     allow_failures:
         - python: 3.6
 install:
-    - pip install -r requirements.txt
+    # - pip install -r requirements.txt
     - pip install flake8  # pytest  # add another testing frameworks later
 before_script:
     # stop the build if there are Python syntax errors or undefined names