Update .travis.yml

Author: rangsimanketkaew

.travis.yml

@@ -10,12 +10,12 @@ python:
   - "3.7"  # 3.7 development branch
 
 install:
-  # - pip install octadist
-  # - pip install -i https://test.pypi.org/simple/ octadist
   - pip install numpy
   - pip install scipy
   - pip install matplotlib
-  - pip install --index-url https://test.pypi.org/simple/ octadist==2.5.2.2
+  # - pip install -i https://test.pypi.org/simple/ octadist
+  # - pip install --index-url https://test.pypi.org/simple/ octadist==2.5.2.2
+  - pip install octadist
 
 script:
   - cd example-py