add ci

Author: o2sh

Diff for: .travis.yml

@@ -0,0 +1,17 @@
+language: rust
+rust:
+  - 1.26.0
+  - 1.27.0
+  - stable
+  - beta
+  - nightly
+sudo: false
+script:
+  - cargo build --verbose
+  - cargo test --verbose
+notifications:
+  email:
+    on_success: never
+branches:
+  only:
+    - master