Introduce TravisCI. (#15)

* Introduce TravisCI, build for x86_64-unknown-linux-{musl, gnu}.

Author: davidbarsky

.travis.yml

@@ -0,0 +1,15 @@
+language: rust
+
+matrix:
+  include:
+  - rust: 1.30.0
+  - rust: stable
+  - rust: beta
+  - rust: nightly
+    env: ALLOW_FAILURES=true
+  - os: osx
+  - env: TARGET=x86_64-unknown-linux-musl
+  - env: TARGET=x86_64-unknown-linux-gnu
+script:
+  - cargo build --verbose --all
+  - cargo test --verbose --all

README.md

@@ -1,5 +1,7 @@
 # Rust Runtime for AWS Lambda
 
+[![Build Status](https://travis-ci.org/awslabs/aws-lambda-rust-runtime.svg?branch=master)](https://travis-ci.org/awslabs/aws-lambda-rust-runtime)
+
 This package makes it easy to run AWS Lambda Functions written in Rust. This workspace includes two crates:
 
 * **`lambda-runtime-client`** is a client SDK for the Lambda Runtime APIs. You probably don't need to use this crate directly!