yarn run build

TODO

• creates snapshot if doesn't exist
• Flow
• tests (CI):

yarn babel-node src/index.js -- --schema=../tests/schema.js --snapshot=../tests/doesntexist.json
yarn babel-node src/index.js -- --schema=../tests/schema.js --snapshot=../tests/snapshot.json
yarn babel-node src/index.js -- --schema=../tests/schema.breaking.js --snapshot=../tests/snapshot.json
yarn babel-node src/index.js -- --schema=../tests/schema.compatible.js --snapshot=../tests/snapshot.json