revert: unintentional commit

misfire. thought I was working on my fork.
we need to turn on branch protection.

Author: shivlaks

buildspec_unit.yaml

@@ -3,12 +3,10 @@ version: 0.2
 phases:
   pre_build:
     commands:
-      - pip install --upgrade pip
       - pip install setuptools wheel twine
       - python setup.py sdist
       - pip install tox
   build:
     commands:
       - twine check dist/*
       - tox tests/unit/
-      - tox tests/integ/