Remove travis.yml (#382)

.travis.yml

@@ -1,25 +0,0 @@
-sudo: required
-language: rust
-branches:
-  only:
-  - master
-
-before_install:
-  # Add an IPv6 config - see the corresponding Travis issue
-  # https://github.com/travis-ci/travis-ci/issues/8361
-  - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then 
-      sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6';
-    fi
-  - rustup component add rustfmt-preview
-
-cache: cargo
-
-matrix:
-  fast_finish: false
-  include:
-    - rust: stable
-
-script:
-  #- cargo fmt -- --write-mode=diff
-  - cargo check --all
-  - cargo test --all