update travis

.travis.yml

@@ -4,20 +4,29 @@ matrix:
   include:
   - python: 3.6
   - python: 3.7
-cache: pip
+  - python: 3.8
+cache:
+  pip: true
+  directories:
+    - ".venv"
+branches:
+  only:
+  - master
+  - /^v\d+\.\d+\.\d+.*$/
+before_install:
+  - curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
+  - source $HOME/.poetry/env
+  - poetry --version
 install:
-- pip install pipenv
-- pip install -r requirements-dev.txt
-- python setup.py install
+  - poetry install -v
 script:
-- make test-ci
+  - make test-ci
 deploy:
-  provider: pypi
-  user: __token__
-  password:
-    secure: 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
+  provider: script
+  script: poetry publish --build -u __token__ -p $PYPI_TOKEN
+  skip_cleanup: true
   skip_existing: true
   on:
     tags: true
     branch: master
-    distributions: sdist bdist_wheel
+    python: "3.6"