Fix travis

Author: skulumani

.travis.yml

@@ -10,8 +10,10 @@ matrix:
           python: 3.6
 
 before_install:
-- pip install --user numpy scipy matplotlib
+- pip install --upgrade pip setuptools wheel
+- pip install --only-binary=numpy,scipy numpy scipy
 - pip install spiceypy --no-cache-dir
+- pip install -r requirements.txt
 install:
 - python setup.py install
 script: