Show notifications for other people's posts

Closes #161

Pachyderm/Sources/Pachyderm/Model/Notification.swift

@@ -21,6 +21,10 @@ public class Notification: Decodable {
         self.id = try container.decode(String.self, forKey: .id)
         if let kind = try? container.decode(Kind.self, forKey: .kind) {
             self.kind = kind
+        } else if let s = try? container.decode(String.self, forKey: .kind),
+                  s == "status" {
+            // represent notifications of other people posting as regular mentions for now
+            self.kind = .mention
         } else {
             self.kind = .unknown
         }