remove travis config

.travis.yml

@@ -1,18 +0,0 @@
-language: rust
-rust:
-  - stable
-cache: cargo
-
-before_script:
-  - export PATH="$PATH:$HOME/.cargo/bin"
-  - which rustfmt || cargo install rustfmt
-
-script:
-  - ./scripts/install-deps.sh
-  - cargo fmt -- --write-mode=diff
-  - cargo build
-  - cargo build --release
-  - cargo test
-  - cargo test --release
-  - cd test-files && cargo run --release -- build && cd -
-  - cd test-files && cargo run -- build && cd -