New protected communitites feature

src/config/mod.rs

@@ -6,6 +6,7 @@ pub(crate) struct Config {
     pub(crate) instance: String,
     pub(crate) status_post_url: Option<String>,
     pub(crate) config_reload_seconds: u32,
+    pub(crate) protected_communities: Vec<String>,
     pub(crate) series: Vec<SeriesConfig>,
 }
 
@@ -34,6 +35,7 @@ impl Default for Config {
             instance: "".to_string(),
             status_post_url: None,
             config_reload_seconds: 21600,
+            protected_communities: vec![],
             series: vec![]
         }
     }