Merge pull request #12671 from Carreau/less-travis

Reduce travis testing.

.travis.yml

@@ -8,7 +8,7 b' addons:'
       - graphviz
 
 python:
-    - 3.6
+    - 3.8
 
 env:
   global:
@@ -41,13 +41,8 b' install:'
     fi
   - pip install -e file://$PWD#egg=ipython[test] --upgrade
   - pip install trio curio --upgrade --upgrade-strategy eager
-  - pip install 'pytest<6' 'matplotlib !=3.2.0' mypy
+  - pip install 'pytest<6' 'matplotlib !=3.2.0'
   - pip install codecov check-manifest pytest-cov --upgrade
-  - pip install mypy
-  - |
-    if [[ "$MASTER_DEPENDENCIES" == "True" ]]; then
-       pip install git+https://github.com/ipython/traitlets#egg=traitlets --force
-    fi
 
 
 script:
@@ -61,12 +56,10 b' script:'
     if [[ "$TRAVIS_PYTHON_VERSION" == "3.8" ]] && [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
       cd /tmp && iptest --coverage xml && cd -
     fi
-  - pytest IPython
-  - mypy IPython/terminal/ptutils.py
-  - mypy IPython/core/c*.py
+  - pytest --maxfail=10 IPython
   # On the latest Python (on Linux) only, make sure that the docs build.
   - |
-    if [[ "$TRAVIS_PYTHON_VERSION" == "3.7" ]] && [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+    if [[ "$TRAVIS_PYTHON_VERSION" == "3.8" ]] && [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
       pip install -r docs/requirements.txt
       python tools/fixup_whats_new_pr.py
       make -C docs/ html SPHINXOPTS="-W"
@@ -97,9 +90,6 b' matrix:'
       language: generic
       python: 3.7
       env: TRAVIS_PYTHON_VERSION=3.7
-    - arch: amd64
-      python: "3.8"
-      env: MASTER_DEPENDENCIES=True
   allow_failures:
     - python: nightly