add travis config

.travis.yml

@@ -0,0 +1,37 @@
+language: rust
+sudo: required
+
+cache: cargo
+
+rust:
+  - stable
+  - beta
+  - nightly
+
+matrix:
+  allow_failures:
+    - rust: beta
+    - rust: nightly
+
+before_script:
+  - rustup component add rustfmt-preview
+
+script:
+  - "if [[ \"$TRAVIS_RUST_VERSION\" == \"stable\" ]] ; then cargo fmt --all -- --check ; else true ; fi"
+  - cargo build --verbose --all
+  - cargo test --verbose --all
+
+after_success: |
+  wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
+  tar xzf master.tar.gz &&
+  cd kcov-master &&
+  mkdir build &&
+  cd build &&
+  cmake .. &&
+  make &&
+  make install DESTDIR=../../kcov-build &&
+  cd ../.. &&
+  rm -rf kcov-master &&
+  for file in target/debug/termwiz-*[^\.d]; do mkdir -p "target/cov/$(basename $file)"; ./kcov-build/usr/local/bin/kcov --exclude-pattern=/.cargo,/usr/lib --verify "target/cov/$(basename $file)" "$file"; done &&
+  bash <(curl -s https://codecov.io/bash) &&
+  echo "Uploaded code coverage"