Updated regex to have the option of adding an extension after @compan…

…yname but before /browserslist-config (#816)

node.js

@@ -7,7 +7,7 @@ var BrowserslistError = require('./error')
 
 var IS_SECTION = /^\s*\[(.+)]\s*$/
 var CONFIG_PATTERN = /^browserslist-config-/
-var SCOPED_CONFIG__PATTERN = /@[^/]+\/browserslist-config(-|$|\/)/
+var SCOPED_CONFIG__PATTERN = /@[^/]+(?:\/[^/]+)?\/browserslist-config(?:-|$|\/)/
 var TIME_TO_UPDATE_CANIUSE = 6 * 30 * 24 * 60 * 60 * 1000
 var FORMAT =
   'Browserslist config should be a string or an array ' +