chore(ci): don't build docs on rust 1.18

seanmonstar · seanmonstar · commit b79f8d32b50c · 2018-02-21T13:45:54.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ matrix:
         - rust: stable
           env: FEATURES="--features compat"
         - rust: 1.18.0
+          env: BUILD_ONLY=1
 
 cache:
     apt: true
