Update Travis CI.

Rouven Spreckels · Rouven Spreckels · commit cd9a6dab7f4f · 2019-04-12T19:34:22.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: rust
 env: FEATURES=""
 matrix:
   include:
-    - rust: 1.35.0
+    - rust: 1.34.0
     - rust: stable
     - rust: beta
     - rust: nightly
