Make a couple new masto properties optional

This will help prevent deser errors when querying pleroma & older
versions of mastodon

src/entities/relationship.rs

@@ -27,5 +27,5 @@ pub struct Relationship {
     /// This field is not techincally nullable with mastodon >= 2.5.0, but
     /// making it `Option<bool>` here means we shouldn't get deser errors when
     /// making calls to pleroma or mastodon<2.5.0 instances
-    pub endorsed: bool,
+    pub endorsed: Option<bool>,
 }

src/entities/status.rs

@@ -31,7 +31,7 @@ pub struct Status {
     /// An array of Emoji
     pub emojis: Vec<Emoji>,
     /// The numbef or replies to this status.
-    pub replies_count: u64,
+    pub replies_count: Option<u64>,
     /// The number of reblogs for the status.
     pub reblogs_count: u64,
     /// The number of favourites for the status.