More Python versions for Travis testing

Author: lindonroberts

.travis.yml

@@ -3,8 +3,11 @@ python:
   - "2.7"
   - "3.5"
   - "3.6"
+  - "3.7"
+  - "3.8"
 
 install:
+  - sudo apt-get install gfortran
   - pip install -r requirements.txt
   - python setup.py build