Fix failing docs

CHANGELOG.md

@@ -1,3 +1,3 @@
-# Version 0.99.2
+# Version 0.99.3
 
 - Initial beta release

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "async-std"
-version = "0.99.2"
+version = "0.99.3"
 authors = [
   "Stjepan Glavina <stjepang@gmail.com>",
   "The async-std Project Developers",

src/io/empty.rs

@@ -62,7 +62,10 @@ impl AsyncRead for Empty {
 
 impl AsyncBufRead for Empty {
     #[inline]
-    fn poll_fill_buf(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
+    fn poll_fill_buf<'a>(
+        self: Pin<&'a mut Self>,
+        _: &mut Context<'_>,
+    ) -> Poll<io::Result<&'a [u8]>> {
         Poll::Ready(Ok(&[]))
     }