Removed misleading comment

No method from the link is actually implemented here.

lib/dialects/postgres/query-generator.js

@@ -321,7 +321,6 @@ var QueryGenerator = {
     return this.fn(fnName, tableName, body, returns, language);
     return this.fn(fnName, tableName, body, returns, language);
   },
   },
 
 
-  // http://www.maori.geek.nz/post/postgres_upsert_update_or_insert_in_ger_using_knex_js
   upsertQuery: function (tableName, insertValues, updateValues, where, rawAttributes, options) {
   upsertQuery: function (tableName, insertValues, updateValues, where, rawAttributes, options) {
     var insert = this.insertQuery(tableName, insertValues, rawAttributes, options);
     var insert = this.insertQuery(tableName, insertValues, rawAttributes, options);
     var update = this.updateQuery(tableName, updateValues, where, options, rawAttributes);
     var update = this.updateQuery(tableName, updateValues, where, options, rawAttributes);