fix: go back to travis 12.04

GerryFerdinandus · GerryFerdinandus · commit 88048e00b9a5 · 2016-10-30T00:09:59.000+02:00
travis 14.04 does not work.
Dependancy error in the linux build.
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,8 @@
 # License: MIT
 
 sudo: required
-dist: trusty
+#dist: trusty
+#trusty does not work in this configuration
 
 os:
   - linux
