Fix travis - why testing in nightly...

Author: hlouzada

.travis.yml

@@ -4,7 +4,7 @@ python:
 #  - "3.7"
   - "3.8"
   - "3.8-dev"  # 3.8 development branch
-  - "nightly"  # nightly build
+# - "nightly"  # nightly build
 install:
   - pip install numpy
   - pip install .