fix default export

Author: jimthedev

engine.js

@@ -8,7 +8,7 @@ var rightPad = require('right-pad');
 // This can be any kind of SystemJS compatible module.
 // We use Commonjs here, but ES6 or AMD would do just
 // fine.
-exports['default'] = function (options) {
+module.exports = function (options) {
 
   var types = options.types;
 
@@ -92,5 +92,3 @@ exports['default'] = function (options) {
     }
   };
 };
-
-module.exports = exports;

index.js

@@ -3,6 +3,21 @@
 var engine = require('./engine');
 var conventionalCommitTypes = require('conventional-commit-types');
 
-module.exports = engine({
+var engineInstance = engine({
   types: conventionalCommitTypes.types
 });
+
+var _extends = function (target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = arguments[i];
+    for (var key in source) {
+      target[key] = source[key];
+    }
+  }
+
+  return target;
+};
+
+exports['default'] = engineInstance;
+
+module.exports = _extends(exports['default'], exports);