hashtags working

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/PostBlock.swift

@@ -10,6 +10,7 @@ import Foundation
 enum PostBlock {
     case text(String)
     case ref(ReferencedId)
+    case hashtag(String)
     
     var is_text: Bool {
         if case .text = self {
@@ -18,6 +19,13 @@ enum PostBlock {
         return false
     }
     
+    var is_hashtag: Bool {
+        if case .hashtag = self {
+            return true
+        }
+        return false
+    }
+    
     var is_ref: Bool {
         if case .ref = self {
             return true