added parameters to query interface method

lib/query-interface.js

@@ -152,7 +152,7 @@ module.exports = (function() {
     return queryAndEmit.call(this, sql, 'addIndex')
   }
 
-  QueryInterface.prototype.showIndex = function() {
+  QueryInterface.prototype.showIndex = function(tableName, options) {
     var sql = this.QueryGenerator.showIndexQuery(tableName, options)
     return queryAndEmit.call(this, sql, 'showIndex')
   }