##Build
On an machine with Amazon Linux:
./build.sh cryptography 2.3.1
On a machine with docker and access to lambci images:
docker run --rm -v `pwd`:/app lambci/lambda:build-python2.7 bash -c "cd /app && /app/build.sh --docker --py2-only cryptography 2.3.1"
docker run --rm -v `pwd`:/app lambci/lambda:build-python3.6 bash -c "cd /app && /app/build.sh --docker --py3-only cryptography 2.3.1"