Fix missin 3.7 env and remove 3.3 test

Author: Juergen Hasch

.travis.yml

@@ -40,9 +40,6 @@ matrix:
     - os: linux
       python: '2.7'
       env: TOXENV=py27-notebook
-    - os: linux
-      python: '3.3'
-      env: TOXENV=py33-notebook
     - os: linux
       python: '3.6'
       env: TOXENV=py36-notebook54
@@ -52,9 +49,6 @@ matrix:
     - os: linux
       python: '3.6'
       env: TOXENV=py36-notebook44
-    - os: linux
-      python: '3.5'
-      env: TOXENV=py35-notebook
     - os: linux
       python: '3.6'
       env: TOXENV=py36-notebook

tox.ini

@@ -14,6 +14,7 @@ basepython =
     pypy: {env:TOXPYTHON:pypy}
     py27: {env:TOXPYTHON:python2.7}
     py36: {env:TOXPYTHON:python3.6}
+    py37: {env:TOXPYTHON:python3.7}
     {spell}: {env:TOXPYTHON:python2.7}
     {appveyorartifacts,lint,check}: {env:TOXPYTHON:python3}
     {condarecipe}: {env:TOXPYTHON:python3.6}