Update troubleshooting.md

Author: damoeb

troubleshooting.md

@@ -4,3 +4,8 @@
 **Problem**: ATOM feeds may return an invalid XML due to a [known issue](https://github.com/jpmonette/feed/issues/112) in a dependency. 
 
 **Mitigation**: Change the output format to RSS
+
+## Bot Protection
+**Problem**: Some sites have protection mechanism against bots. Requests to those sites may only return a minimal markup containing redirects or errors.
+
+**Mitigation**: [Activate JavaScript](https://github.com/damoeb/rss-proxy/#javascript-support) will most likely bypass these mechanisms.