chore(ci): unpin nightly version

ashleygwilliams · ashleygwilliams · commit 8d8808060279 · 2018-12-04T17:39:34.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ matrix:
   include:
 
   # tests pass
-  - rust: nightly-2018-09-09
+  - rust: nightly
     script:
     - cargo test --all --locked
     - rustup component add rustfmt-preview
