Update travis.yml
Resoves issues related to
@@ -9,7 +9,7 @@ rust:
before_install:
- export PATH="$PATH:$HOME/.cargo/bin"
- - rustup component add rustfmt-preview clippy-preview
+ - rustup component add rustfmt
before_script:
- (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
