Use most recent nightly build

mfpiccolo · mfpiccolo · commit 48c19ee2e7e0 · 2015-12-31T12:47:33.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ sudo: false
 rust:
   - stable
   - beta
-  - nightly-2015-12-23
+  - nightly-2015-12-30
   - nightly
 addons:
   postgresql: '9.4'
