Add .travis.yml

Author: lqmanh

.travis.yml

@@ -0,0 +1,11 @@
+language: python
+python:
+  - "3.7"
+  - "3.8"
+  - "pypy3"
+before_install:
+  - pip install poetry
+install:
+  - poetry install
+script:
+  - poetry run pytest