Add read_some free function to read some bytes

src/io/mod.rs

@@ -35,6 +35,7 @@ mod copy;
 mod flush;
 mod read_exact;
 mod read_to_end;
+mod read;
 mod split;
 mod window;
 mod write_all;
@@ -42,6 +43,7 @@ pub use self::copy::{copy, Copy};
 pub use self::flush::{flush, Flush};
 pub use self::read_exact::{read_exact, ReadExact};
 pub use self::read_to_end::{read_to_end, ReadToEnd};
+pub use self::read::{read_some, ReadSome};
 pub use self::split::{ReadHalf, WriteHalf};
 pub use self::window::Window;
 pub use self::write_all::{write_all, WriteAll};