TST: Create .travis.yml (#20)

Introduce travis CI

.travis.yml

@@ -0,0 +1,30 @@
+sudo: required
+dist: bionic
+language: python
+cache: pip
+
+python:
+ - '3.6'
+ - '3.7'
+ - '3.8'
+
+env:
+ - PANDAS="<1"
+ - PANDAS="==1.0.5"
+ - PANDAS=">1.1.0"
+
+
+before_install:
+ - python -m pip install --upgrade pip setuptools wheel
+ - pip install -r requirements.txt
+ - pip install -r requirements_test.txt
+ - pip install "pandas$PANDAS"
+
+install:
+ - check-manifest
+ - python setup.py sdist bdist_wheel
+ - twine check dist/*
+ - pip install -e .
+
+script:
+ - pytest tests/