Update README.md

http://help.luracast.com/restler/examples/  - don't work anymore
replaced by   https://restler3.luracast.com/examples/index.html

htdocs/api/README.md

@@ -41,7 +41,7 @@ https://**yourdolibarr.tld**/mydolibarr/api/index.php/otherservice?DOLAPIKEY=**a
 Develop an API
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-The API uses Lucarast Restler framework. Please check documentation https://www.luracast.com/products/restler and examples http://help.luracast.com/restler/examples/ 
+The API uses Lucarast Restler framework. Please check documentation https://www.luracast.com/products/restler and examples https://restler3.luracast.com/examples/index.html  
 
 Github contains also useful information : https://github.com/Luracast/Restler