Update Travis build matrix

Author: Jacob Cook

.travis.yml

@@ -2,5 +2,13 @@ language: python
 python:
   - "2.7"  # Everything
   - "3.4"  # Debian 8 (Jessie) and Ubuntu 14.04 (Trusty)
-  - "3.5"  # Debian 9 (Sid) and Ubuntu 16.04 (Xenial)
+  - "3.5"  # Debian 9 (Stretch) and Ubuntu 16.04 (Xenial)
+  - "3.6"  # Debian 10 (Buster), Ubuntu 17.10 (Artful) & 18.04 (Bionic)
+  - "3.7-dev"  # Python alphas/betas
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - python: "3.7-dev"  # Alpha and beta versions can fail
+
 script: python tests.py

README.md

@@ -1,6 +1,6 @@
 ## python-nginx
 
-![](https://travis-ci.org/peakwinter/python-nginx.svg?branch=master)
+[![](https://travis-ci.org/peakwinter/python-nginx.svg?branch=master)](https://travis-ci.org/peakwinter/python-nginx)
 
 A module for easily creating and modifying nginx serverblock configurations in Python (including comments!).