fix a bug in .travis.yml

Stjepan Glavina · Stjepan Glavina · commit 184427cc0b4a · 2019-09-26T23:15:56.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -50,7 +50,7 @@ matrix:
       rust: nightly
       os: linux
       script:
-        - cargo doc --features docs unstable
+        - cargo doc --features docs,unstable
 
     - name: book
       rust: nightly
