Travis tuning

.travis.yml

@@ -1,13 +1,15 @@
 language: rust
 
+cache: cargo
 rust:
   - stable
   - beta
   - nightly
 
-allow_failures:
-  - rust: nightly
-fast_finish: true
+matrix:
+  allow_failures:
+    - rust: nightly
+  fast_finish: true
 
 env:
   - TARGET=aarch64-unknown-linux-gnu
@@ -16,9 +18,10 @@ env:
   - TARGET=thumbv7em-none-eabihf
 
 install:
+  - cargo install xargo || true
   - rustup component add rust-src
   - rustup target add $TARGET
 
 script:
-  - cargo build --target $TARGET
-  - cargo test --target $TARGET
+  - xargo build --no-default-features --verbose --target $TARGET
+  - xargo test --no-default-features --verbose --target $TARGET