Move the clippy/fmt checks to start; we want to fail fast

.travis.yml

@@ -17,6 +17,9 @@ before_script:
   - 'echo $PATH'
 
 script:
+  - cargo clippy --all
+  - cargo fmt --all -- --check
+
   - cargo test --no-run
   - cargo test
   - cargo test --release --no-run
@@ -25,10 +28,6 @@ script:
   - cd aeron-driver-sys/
   - cargo test --features "static"
 
-  - cd ..
-  - cargo clippy --all
-  - cargo fmt --all -- --check
-
 branches:
   only:
     - master