Add support for `hummus-recipe`: fails with this._getEncryptOptions not a function

Reproducible example: https://codesandbox.io/s/distracted-bardeen-kks92
Public deployment with logs: https://zeit.co/pgdm/csb-kks92/qo1379ftg

ERROR	TypeError: this._getEncryptOptions is not a function
    at new Recipe (/var/task/node_modules/hummus-recipe/lib/Recipe.js:31:36)
    at /var/task/api/index.js:6:18
    at Layer.handle [as handle_request] (/var/task/node_modules/express/lib/router/layer.js:95:5)
    at next (/var/task/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/var/task/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/var/task/node_modules/express/lib/router/layer.js:95:5)
    at /var/task/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/var/task/node_modules/express/lib/router/index.js:335:12)
    at next (/var/task/node_modules/express/lib/router/index.js:275:10)
    at expressInit (/var/task/node_modules/express/lib/middleware/init.js:40:5)

Start with the CodeSandbox reproduction and the stack trace, then inspect node_modules/hummus-recipe/lib/Recipe.js at line 31 and api/index.js at line 6. Determine why the deployed dependency lacks _getEncryptOptions; done means the reproduced deployment no longer throws this TypeError.