title: How to configure flutter with travis CI
body: <p>I'm trying to configure my flutter application with travis-CI but I cant figure out a way to do that.</p>
  
  <p>I tried my .travis.yaml file with following code</p>
  
  <pre><code>  - linux
  sudo: false
  addons:
    apt:
      # Flutter depends on /usr/lib/x86_64-linux-gnu/libstdc++.so.6 version GLIBCXX_3.4.18
      sources:
        - ubuntu-toolchain-r-test # if we don't specify this, the libstdc++6 we get is the wrong version
      packages:
        - libstdc++6
        - fonts-droid-fallback
  before_script:
    - git clone https://github.com/flutter/flutter.git -b beta
    - ./flutter/bin/flutter doctor
  script:
    - ./flutter/bin/flutter test
  cache:
    directories:
      - $HOME/.pub-cache
  </code></pre>
  
  <p>As I'm new to this travis-CI thing can you help me to get out from this problem.</p>