Use nightly to fix a rustdoc problem

carols10cents · carols10cents · commit 16df535a8c21 · 2019-03-08T21:13:06.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ dist: trusty
 language: rust
 cache: cargo
 rust:
-  - 1.31.1
+  - nightly
 branches:
   only:
   - master
