Merge pull request #12417 from SylvainCorlay/enable-test-python-3.6

.travis.yml

@@ -36,7 +36,7 b' install:'
   - pip install setuptools --upgrade
   - if [[ "$TRAVIS_PYTHON_VERSION" == "3.6" ]]; then
       echo "for the tiem being still test on 3.6";
-      sed -i bkp s/7/6/g setup.py;
+      sed -ibkp s/7/6/g setup.py;
       git diff;
     fi
   - pip install -e file://$PWD#egg=ipython[test] --upgrade
@@ -77,6 +77,9 b' after_success:'
 matrix:
   include:
     - arch: amd64
+      python: "3.6"
+      dist: xenial
+    - arch: amd64
       python: "3.7"
       dist: xenial
     - arch: amd64