changelog: add mention to IgnoreProviders

Author: hsanjuan

docs/changelogs/v0.35.md

@@ -18,6 +18,13 @@ This release  was brought to you by the [Shipyard](http://ipshipyard.com/) team.
 
 ### 🔦 Highlights
 
+##### `Routing.IgnoreProviders`
+
+This new option allows ignoring specific peer IDs when returned by the content
+routing system as providers of content. See the
+[documentation](https://github.com/ipfs/kubo/blob/master/docs/config.md#routingignoreproviders)
+for for information.
+
 #### 📦️ Important dependency updates
 
 ### 📝 Changelog