+matrix:
+ include:
+ - python: "2.7"
+ env: TOXENV=py27
+ - python: "3.4"
+ env: TOXENV=py34
+ - python: "3.5"
+ env: TOXENV=py35
+ - python: "3.6"
+ env: TOXENV=py36
+ - python: "3.7"
+ dist: xenial
+ env: TOXENV=py37
+ - python: "2.7"
+ env: TOXENV=py27-postgres
+ - python: "3.4"
+ env: TOXENV=py34-postgres
+ - python: "3.5"
+ env: TOXENV=py35-postgres
+ - python: "3.6"
+ env: TOXENV=py36-postgres
+ - python: "3.7"
+ dist: xenial
+ env: TOXENV=py37-postgres
+ - python: "2.7"
+ env: TOXENV=py27-sqlite
+ - python: "3.4"
+ env: TOXENV=py34-sqlite
+ - python: "3.5"
+ env: TOXENV=py35-sqlite
+ - python: "3.6"
+ env: TOXENV=py36-sqlite
+ - python: "3.7"
+ dist: xenial
+ env: TOXENV=py37-sqlite
+ - python: "2.7"
+ env: TOXENV=py27-flake8
+ - python: "3.7"
+ dist: xenial
+ env: TOXENV=py37-flake8