Enabling Travis automated tests

.travis.yml

@@ -0,0 +1,10 @@
+language: python
+python:
+  - "3.5"
+
+# command to install dependencies
+install:
+  - pip3 install -e .
+
+# command to run tests
+script: ./run_tests.py

README.md

@@ -1,5 +1,7 @@
 # Minimalistic Gridworld Environment (MiniGrid)
 
+[![Build Status](https://travis-ci.org/maximecb/gym-minigrid.svg?branch=master)](https://travis-ci.org/maximecb/gym-minigrid)
+
 There are other gridworld Gym environments out there, but this one is
 designed to be particularly simple, lightweight and fast. The code has very few
 dependencies, making it less likely to break or fail to install. It loads no