Try updating to trusty

jsmnbom · jsmnbom · commit 51759307d75a · 2017-06-22T18:09:29.000+02:00
Currently about 1min of build time is spent updating libssl... maybe it's newer on trusty?
diff --git a/.travis.yml b/.travis.yml
@@ -8,6 +8,9 @@ python:
   - "pypy"
   - "pypy3"
 
+dist: trusty
+sudo: false
+
 branches:
   only:
     - master
@@ -31,4 +34,4 @@ script:
   - python ./setup.py bdist_dumb
 
 after_success:
-  coveralls
+  coveralls
