Using trusty as distro for python 2.6 build

shiplu · shiplu · commit 23c2e28a801a · 2020-05-20T13:53:51.000+02:00
Travis changed the default distro to Xenial which doesn't have python
2.6 environment.
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,4 @@
+dist: trusty
 sudo: false
 language: python
 python:
