CI: Do not install future, remove futures check

Author: effigies

.circleci/config.yml

@@ -317,16 +317,14 @@ jobs:
           name: Check pypi preconditions
           command: |
             pyenv local 3.5.2
-            pip install --upgrade twine future wheel readme_renderer setuptools
+            pip install --upgrade twine wheel readme_renderer setuptools
             python setup.py check -r -s
             python setup.py sdist bdist_wheel
       - run:
           name: Validate Python 3 installation
           command: |
             pyenv local 3.5.2
             pip install dist/nipype-*-py3-none-any.whl
-            # Futures should not install in Python 3
-            test $(pip show futures 2>/dev/null | wc -l) = "0"
       - store_artifacts:
           path: /home/circleci/nipype/dist
 
@@ -340,7 +338,7 @@ jobs:
           name: Deploy to PyPI
           command: |
             pyenv local 3.5.2
-            pip install --upgrade twine future wheel readme_renderer setuptools
+            pip install --upgrade twine wheel readme_renderer setuptools
             python setup.py check -r -s
             python setup.py sdist bdist_wheel
             twine upload dist/*