fixup! fixup! fixup! Add read_exact attribute

fix ensure_no_std

ensure_no_std/src/bin/main.rs

@@ -24,7 +24,7 @@ struct DekuTest {
     count: u8,
     #[deku(count = "count", pad_bytes_after = "8")]
     data: Vec<u8>,
-    #[deku(read_exact = "1")]
+    #[deku(count = "1")]
     after: Vec<u8>,
 }