drop testing against py34

Author: jlwalke2

.travis.yml

@@ -31,7 +31,6 @@ matrix:
       env: TOXENV=py36-tests-codecov TOX_SKIP_MISSING_INTERPRETERS=False
     - python: 3.7
       env: TOXENV=py37-tests-codecov TOX_SKIP_MISSING_INTERPRETERS=False
-# TODO:  Enable when numpy, Pandas, and other dependencies are released on 3.8
     - python: 3.8
       env: TOXENV=py38-tests-codecov TOX_SKIP_MISSING_INTERPRETERS=False