Add back max_pending_accept_reset_streams

Adds back this function which was previously in hyper 0.14.

The original merge into hyper is
[here](https://github.com/hyperium/hyper/pull/3201/files/e8296d1c5bded88a508f1ca1f35791c30803182d)

This follows the original closely, with some minor wording improvements in the
outer line docs.

Closes hyperium/hyper#3461.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "hyper-util"
-version = "0.1.1"
+version = "0.1.2"
 description = "hyper utilities"
 readme = "README.md"
 homepage = "https://hyper.rs"

src/client/legacy/client.rs

@@ -1230,6 +1230,21 @@ impl Builder {
         self
     }
 
+    /// Configures the maximum number of pending reset streams allowed before a GOAWAY is sent.
+    ///
+    /// This defaults to the [`h2`](https://crates.io/crates/h2) default value, which is currently 20.
+    ///
+    /// See <https://github.com/hyperium/hyper/issues/2877> for more information.
+    #[cfg(feature = "http2")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
+    pub fn http2_max_pending_accept_reset_streams(
+        &mut self,
+        max: impl Into<Option<usize>>,
+    ) -> &mut Self {
+        self.h2_builder.max_pending_accept_reset_streams = max.into();
+        self
+    }
+
     /// Sets the [`SETTINGS_INITIAL_WINDOW_SIZE`][spec] option for HTTP2
     /// stream-level flow control.
     ///

src/server/conn/auto.rs

@@ -319,6 +319,16 @@ impl<E> Http2Builder<'_, E> {
         }
     }
 
+    /// Configures the maximum number of pending reset streams allowed before a GOAWAY is sent.
+    ///
+    /// This defaults to the [`h2`](https://crates.io/crates/h2) default value, which is currently 20.
+    ///
+    /// See <https://github.com/hyperium/hyper/issues/2877> for more information.
+    pub fn max_pending_accept_reset_streams(mut self, max: impl Into<Option<usize>>) -> Self {
+        self.protocol.http2_max_pending_accept_reset_streams(max);
+        self
+    }
+
     /// Sets the [`SETTINGS_INITIAL_WINDOW_SIZE`][spec] option for HTTP2
     /// stream-level flow control.
     ///