feat(packet): implement From<Fulfill/Reject> for bytes05::BytesMut

ILP-Packet is built using Bytes 0.4. The Futures 0.3 ecosystem's HTTP crates use Bytes 0.5.
Porting this crate to use Bytes 0.5 is non-trivial due to significant breaking changes in the
Bytes API:

tokio-rs/bytes#350
tokio-rs/bytes#288

crates/interledger-packet/Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/interledger-rs/interledger-rs"
 
 [dependencies]
 byteorder = { version = "1.3.2", default-features = false }
+bytes05 = { package = "bytes", version = "0.5", default-features = false, features = ["serde"] }
 bytes = { version = "0.4.12", default-features = false, features = ["serde"] }
 chrono = { version = "0.4.9", default-features = false }
 hex = { version = "0.4.0", default-features = false }

crates/interledger-packet/src/errors.rs

@@ -41,7 +41,7 @@ quick_error! {
             description(descr)
             display("Invalid Packet {}", descr)
         }
-        Other(err: Box<dyn std::error::Error>) {
+        Other(err: Box<dyn std::error::Error + Send>) {
             cause(&**err)
             description(err.description())
             display("Error {}", err.description())

crates/interledger-packet/src/packet.rs

@@ -359,6 +359,15 @@ impl From<Fulfill> for BytesMut {
     }
 }
 
+impl From<Fulfill> for bytes05::BytesMut {
+    fn from(fulfill: Fulfill) -> Self {
+        // bytes 0.4
+        let b = fulfill.buffer.as_ref();
+        // convert to Bytes05
+        bytes05::BytesMut::from(b)
+    }
+}
+
 impl fmt::Debug for Fulfill {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         formatter
@@ -481,6 +490,15 @@ impl From<Reject> for BytesMut {
     }
 }
 
+impl From<Reject> for bytes05::BytesMut {
+    fn from(reject: Reject) -> Self {
+        // bytes 0.4
+        let b = reject.buffer.as_ref();
+        // convert to Bytes05
+        bytes05::BytesMut::from(b)
+    }
+}
+
 impl fmt::Debug for Reject {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         formatter