Replace get_members_info with a more appropriate route

src/data/group_member.rs

@@ -69,6 +69,10 @@ impl GroupMember {
     pub fn is_moderator(&self) -> bool {
         self.level <= GroupMembershipLevel::MODERATOR
     }
+
+    pub fn is_at_least_member(&self) -> bool {
+        self.level <= GroupMembershipLevel::MEMBER
+    }
 }
 
 #[cfg(test)]