Merge pull request #96 from carrot/env-fix

fix 🐛 with opts.env being set to null in cli

Author: Jeff Escalante

lib/config.js

@@ -39,6 +39,8 @@ export default class Config {
    * @return {Object} validated and fully filled out objects
    */
   validateOpts (opts) {
+    // override argpare's annoying use of null values
+    if (opts.env === null) { opts.env = undefined }
     const schema = Joi.object().keys({
       root: Joi.string().required(),
       env: Joi.string(),