Remove Travis configuration

.travis.yml

@@ -1,41 +0,0 @@
-language: rust
-sudo: required
-dist: trusty
-addons:
-    apt:
-        update: true
-        packages:
-            - libssl-dev
-cache: cargo
-rust:
-  - stable
-os:
-  - linux
-  - osx
-matrix:
-  allow_failures:
-    - rust: nightly
-  include:
-    - os: linux
-      rust: beta
-    - os: linux
-      rust: nightly
-
-before_script:
-  - if [[ "$TRAVIS_RUST_VERSION" == stable ]]; then
-      rustup component add rustfmt;
-    fi
-  - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then
-      sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6';
-    fi
-
-script:
-- cargo clean
-- cargo build --all-features
-- cargo check --benches
-- RUST_BACKTRACE=1 cargo test --all-features
-- RUST_BACKTRACE=1 cargo test --all-features -- --ignored
-- if [[ "$TRAVIS_RUST_VERSION" == stable ]]; then
-    cargo fmt -- --check;
-    cd quinn-proto && cargo test --no-default-features;
-  fi