update example

README.md

@@ -9,6 +9,11 @@ use strafesnet_roblox_bot_file::{File,TimedBlockId};
 let file=std::fs::File::open("bot_file")?;
 let input=std::io::BufReader::new(file);
 let mut bot_file=File::new(input)?;
+
+// read the whole file
+let block=bot_file.read_all()?;
+
+// or do data streaming block by block
 for &TimedBlockId{time,block_id} in &bot_file.header.offline_blocks_timeline{
 	// header is immutably borrowed
 	// while data is mutably borrowed