Fix warnings

src/hpack/decoder.rs

@@ -151,6 +151,7 @@ impl Decoder {
     }
 
     /// Queues a potential size update
+    #[allow(dead_code)]
     pub fn queue_size_update(&mut self, size: usize) {
         let size = match self.max_size_update {
             Some(v) => cmp::max(v, size),

src/hpack/encoder.rs

@@ -44,6 +44,7 @@ impl Encoder {
     /// Queues a max size update.
     ///
     /// The next call to `encode` will include a dynamic size update frame.
+    #[allow(dead_code)]
     pub fn update_max_size(&mut self, val: usize) {
         match self.size_update {
             Some(SizeUpdate::One(old)) => {