Use non-preview name of Clippy rustup component

dtolnay · dtolnay · commit e6b02d1b53cf · 2019-03-01T23:16:54.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -25,7 +25,7 @@ matrix:
     - rust: nightly
       name: Clippy
       script:
-        - rustup component add clippy-preview || travis_terminate 0
+        - rustup component add clippy || travis_terminate 0
         - cargo clippy
 
 script:
