Removed cargo fmt from travis.

.travis.yml

@@ -22,9 +22,7 @@ before_script:
   - |
     pip install 'travis-cargo<0.2' --user &&
     export PATH=$HOME/.local/bin:$PATH
-  - (cargo install rustfmt || true)
 script:
-  - cargo fmt -- --write-mode=diff
   - |
     travis-cargo build &&
     travis-cargo test &&