CI: Test Numpy version under Python 3.7

Author: effigies

.circleci/config.yml

@@ -1,5 +1,5 @@
 _machine_kwds: &machine_kwds
-  image: circleci/classic:201710-02
+  image: circleci/classic:201808-01
 
 _store_artifacts_kwds: &store_artifacts_kwds
   path: /home/circleci/work/tests
@@ -356,6 +356,13 @@ jobs:
             pip install dist/nipype-*-py2.py3-none-any.whl
             # Futures should not install in Python 3
             test $(pip show futures 2>/dev/null | wc -l) = "0"
+      - run:
+          name: Validate Python 3.7 installation
+          command: |
+            pyenv local 3.7.0
+            pip install dist/nipype-*-py2.py3-none-any.whl
+            # Futures should not install in Python 3
+            test "$(pip show numpy | grep Version)" \> "Version: 1.15.2"
       - store_artifacts:
           path: /home/circleci/nipype/dist