Update project base

.gitlab-ci.yml

@@ -0,0 +1,21 @@
+image: python:3.6
+
+stages:
+  - test
+
+before_script:
+  - pip install tox
+
+python36:
+  image: python:3.6
+  stage: test
+  script: tox -e py36
+
+python37:
+  image: python:3.7
+  stage: test
+  script: tox -e py37
+
+linters:
+  stage: test
+  script: tox -e linters