Add Error::is_reset function (#618)

Author: bruceg

src/error.rs

@@ -59,10 +59,7 @@ impl Error {
 
     /// Returns true if the error is an io::Error
     pub fn is_io(&self) -> bool {
-        match self.kind {
-            Kind::Io(_) => true,
-            _ => false,
-        }
+        matches!(self.kind, Kind::Io(..))
     }
 
     /// Returns the error if the error is an io::Error
@@ -92,6 +89,11 @@ impl Error {
         matches!(self.kind, Kind::GoAway(..))
     }
 
+    /// Returns true if the error is from a `RST_STREAM`.
+    pub fn is_reset(&self) -> bool {
+        matches!(self.kind, Kind::Reset(..))
+    }
+
     /// Returns true if the error was received in a frame from the remote.
     ///
     /// Such as from a received `RST_STREAM` or `GOAWAY` frame.