[minor] Update whitespace

lib/nconf/provider.js

@@ -42,9 +42,10 @@ var Provider = exports.Provider = function (options) {
 ['defaults', 'overrides'].forEach(function (type) {
   Provider.prototype[type] = function (options) {
     options = options || {};
-    if(!options.type) {
+    if (!options.type) {
       options.type = 'literal';
     }
+    
     return this.add(type, options);
   };
 });