Enforce clippy in travis

Author: alex

.travis.yml

@@ -21,7 +21,7 @@ install:
       else
           cargo install --force cargo-xbuild
       fi
-    - rustup component add rust-src rustfmt
+    - rustup component add rust-src rustfmt clippy
 
 script:
     - ./tests/run_tests.py
@@ -31,6 +31,7 @@ script:
           (cd "$p" && cargo fmt --all -- --check) || exit 1
         fi
       done
+    - cargo clippy
 
 after_failure:
     - dmesg