- added extends and implements

Author: Serhioromano

iecst.js

@@ -23,7 +23,7 @@ function hljsDefineIECST(hljs) {
                 "if then end_if elsif else case of end_case " +
                 "to do by while repeat end_while end_repeat for end_for from " +
                 "private public protected " +
-                "or and not xor le ge eq ne ge lt constant return exit at retain non_retain task with until using extend",
+                "or and not xor le ge eq ne ge lt constant return exit at retain non_retain task with until using extends implements",
             title:
                 "program end_program function end_function function_block end_function_block configuration " +
                 "end_configuration action end_action transition end_transition type end_type struct end_struct step " +