feat: enable travis CI

.travis.yml

@@ -0,0 +1,26 @@
+language: rust
+rust: 1.34.2
+dist: xenial
+sudo: true
+cache:
+  cargo: true
+  timeout: 1024
+
+git:
+  depth: 2
+
+env:
+  global:
+    - RUST_BACKTRACE=full
+
+before_install:
+  - cargo sweep --version || cargo install --git https://github.com/holmgr/cargo-sweep --rev 4770deda37a2203c783e301b8c0c895964e8971e
+  - cargo sweep -s
+
+script: make ci
+
+before_cache:
+  - rm -rf ./target/release
+  - rm -rf ./target/debug/incremental/
+  - cargo sweep -f
+

README.md

@@ -1,2 +1,4 @@
 # ckb-contracts
+[![Build Status](https://travis-ci.com/nervosnetwork/ckb-system-scripts.svg?branch=master)](https://travis-ci.com/nervosnetwork/ckb-system-scripts)
+
 CKB's official smart contracts. Those contracts will be included in system cells in genesis blocks