lint with clippy during travis

.travis.yml

@@ -3,4 +3,9 @@ rust:
   - stable
   - beta
   - 1.30.0  # The minimal Rust version we claim we need.
-
+before_script:
+  # Get clippy-preview if clippy is not available for 1.30.0 not to break
+  - rustup component add clippy || rustup component add clippy-preview
+script:
+  - cargo clippy -- -D warnings
+  - cargo test --verbose

src/lib.rs

@@ -2,7 +2,14 @@
 //!
 //! This crate contains all the moving parts of the Routinator. The
 //! application itself, via `main.rs` is only a very tiny frontend.
-#![allow(unknown_lints)] // Clippy for 1.30.
+
+// Clippy due to multi-versioning
+#![allow(renamed_and_removed_lints)]
+
+// Clippy for 1.30.
+#![allow(unknown_lints)]
+#![allow(needless_pass_by_value)]
+#![allow(map_clone)]
 
 extern crate bytes;
 extern crate chrono;