Provide Take decorator that limits Buf size

test/test_buf_take.rs

@@ -0,0 +1,12 @@
+use bytes::*;
+use std::io::{Cursor, Read};
+
+#[test]
+pub fn test_take_from_buf() {
+    let mut buf = Take::new(Cursor::new(b"hello world".to_vec()), 5);
+    let mut res = vec![];
+
+    buf.read_to_end(&mut res);
+
+    assert_eq!(&res, b"hello");
+}