update donors

DONATIONS.md

@@ -17,3 +17,5 @@ We would like to thank everyone that contributed to this library. If you find ou
 - **Walter Schnell** (10$)
 
 - [**Learn on demand Systems**](http://www.learnondemandsystems.com/) (1000$) 
+
+- **ivanhjc** (5$)

dist/showdown.js

@@ -1,4 +1,4 @@
-;/*! showdown v 1.8.4 - 05-12-2017 */
+;/*! showdown v 1.8.4 - 09-12-2017 */
 (function(){
 /**
  * Created by Tivie on 13-07-2015.