Merge pull request #60 from ConsenSys/sam-cli

Install aws-sam-cli for build

Author: barlock

.travis.yml

@@ -11,7 +11,7 @@ before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH="$HOME/.yarn/bin:$PATH"
   - echo "Installing AWS CLI"
-  - pip install --upgrade --user awscli
+  - pip install --upgrade --user awscli aws-sam-cli
 
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