Disable trusty build in travis

TheDan64 · geofft · commit 83beda34cbfd · 2019-05-06T09:51:09.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,5 @@
 matrix:
     include:
-        - dist: trusty
         - dist: xenial
 
 language: rust
