feat(enjoy-by): add before as an alias to enjoy-by

Author: zkat

README.md

@@ -231,7 +231,7 @@ even though npm itself does.
 
 ##### <a name="opts-enjoy-by"></a> `opts.enjoy-by`
 
-* Alias: `opts.enjoyBy`
+* Alias: `opts.enjoyBy`, `opts.before`
 * Type: Date-able
 * Default: undefined
 

lib/util/opt-check.js

@@ -13,6 +13,7 @@ module.exports = figgyPudding({
   dmode: {},
   'enjoy-by': 'enjoyBy',
   enjoyBy: {},
+  before: 'enjoyBy',
   fmode: {},
   'fetch-retries': { default: 2 },
   'fetch-retry-factor': { default: 10 },