Integrate rustfmt into travis.

Author: valentinewallace

.travis.yml

@@ -11,6 +11,8 @@ before_install:
   - sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc binutils-dev libiberty-dev
 
 script:
+     # Check formatting.
+      - if [ "$(rustup show | grep stable)" != "" ]; then rustup component add rustfmt && cargo fmt --all -- --check; fi      - if [ "$(rustup show | grep 1.34.2)" != "" ]; then rustup component add rustfmt && cd fuzz && cargo fmt --all -- --check && cd ../; fi
      # Build workspaces with Rust stable, beta, and 1.34.0
      - if [ "$(rustup show | grep default | grep 1.22.0)" == "" ]; then RUSTFLAGS="-C link-dead-code" cargo build --verbose; fi
      # Build lightning workspace with Rust 1.22.0