Update README.md

Author: ekoeryanto

README.md

@@ -20,6 +20,7 @@ Internationalised error messages for [Ajv](https://github.com/epoberezkin/ajv) -
 |🇪🇸 es|Spanish  |[jpablom](https://github.com/jpablom)|✓|-|-|
 |🇫🇷 fr|French   |[monlouisj](https://github.com/monlouisj)|✓|✓|-|
 |🇭🇺 hu|Hungarian|[szilveszter9](https://github.com/szilveszter9)|✓|-|-|
+|🇮🇩 id|Indonesian|[Eko Eryanto](https://github.com/ekoeryanto)|✓|✓|✓|
 |🇮🇹 it|Italian  |[jasoniangreen](https://github.com/jasoniangreen)<br>[lucacorti](https://github.com/lucacorti)|✓<br>&nbsp;|<br>✓|<br>✓|
 |🇯🇵 ja|Japanese |[gilgongo](https://github.com/gilgongo)|✓|-|-|
 |🇰🇷 ko|Korean |[MinByeongDon](https://github.com/MinByeongDon)|✓|✓|✓|