travis: run cargo fmt on subcrates as well

Author: matthiaskrgr

.travis.yml

@@ -15,6 +15,13 @@ matrix:
         - rustup component add rustfmt
       script:
         - cargo fmt --all -- --check
+        - cd crates/cargo-test-macro
+        - cargo fmt --all -- --check
+        - cd ../crates-io
+        - cargo fmt --all -- --check
+        - cd ../resolver-tests
+        - cargo fmt --all -- --check
+        - cd ../../
 
     - env: TARGET=x86_64-unknown-linux-gnu
            ALT=i686-unknown-linux-gnu