Add minimal .travis.yml CI config file

Signed-off-by: Steven Esser <sesser@nexb.com>

Author: steven-esser

.travis.yml

@@ -0,0 +1,21 @@
+# This is a skeleton Travis CI config file that provides a starting point for adding CI
+# to a Python project. Since we primarily develop in python3, this skeleton config file
+# will be specific to that language. 
+#
+# See https://config.travis-ci.com/ for a full list of configuration options.
+
+os: linux
+
+dist: xenial
+
+language: python
+python:
+  - "3.6"
+  - "3.7"
+  - "3.8"
+
+# Scripts to run at install stage
+install: ./configure
+
+# Scripts to run at script stage
+script: bin/pytest