Bump travis version

sfackler · sfackler · commit 5b690479d44a · 2017-02-21T19:31:37.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: rust
 rust:
 - nightly
-- 1.10.0
+- 1.15.0
 addons:
   postgresql: 9.4
 cache: cargo
