Update dependency and Fix warnings

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

Author: koushiro

Cargo.toml

@@ -23,7 +23,7 @@ path = "lib.rs"
 slog = "2.1"
 thread_local = "1"
 take_mut = "0.2.0"
-crossbeam-channel = "0.3"
+crossbeam-channel = "0.4"
 
 [package.metadata.docs.rs]
 features = ["nested-values", "dynamic-keys"]

README.md

@@ -12,6 +12,10 @@
   <a href="https://gitter.im/dpc/slog-async">
       <img src="https://img.shields.io/gitter/room/dpc/slog-rs.svg" alt="slog-rs Gitter Chat">
   </a>
+
+  <a href="https://deps.rs/repo/github/slog-rs/async">
+        <img src="https://deps.rs/repo/github/slog-rs/async/status.svg" alt="slog-rs Dependency Status">
+  </a>
 </p>
 
 For more information, help, to report issues etc. see [slog-rs][slog-rs].

lib.rs

@@ -73,15 +73,15 @@ use take_mut::take;
 
 // {{{ Serializer
 struct ToSendSerializer {
-    kv: Box<KV + Send>,
+    kv: Box<dyn KV + Send>,
 }
 
 impl ToSendSerializer {
     fn new() -> Self {
         ToSendSerializer { kv: Box::new(()) }
     }
 
-    fn finish(self) -> Box<KV + Send> {
+    fn finish(self) -> Box<dyn KV + Send> {
         self.kv
     }
 }
@@ -184,7 +184,7 @@ pub enum AsyncError {
     /// Could not send record to worker thread due to full queue
     Full,
     /// Fatal problem - mutex or channel poisoning issue
-    Fatal(Box<std::error::Error>),
+    Fatal(Box<dyn std::error::Error>),
 }
 
 impl<T> From<crossbeam_channel::TrySendError<T>> for AsyncError {
@@ -367,7 +367,7 @@ pub struct AsyncGuard {
 
 impl Drop for AsyncGuard {
     fn drop(&mut self) {
-        let _err: Result<(), Box<std::error::Error>> = {
+        let _err: Result<(), Box<dyn std::error::Error>> = {
             || {
                 let _ = self.tx.send(AsyncMsg::Finish);
                 let join = self.join.take().unwrap();
@@ -478,7 +478,7 @@ struct AsyncRecord {
     location: Box<slog::RecordLocation>,
     tag: String,
     logger_values: OwnedKVList,
-    kv: Box<KV + Send>,
+    kv: Box<dyn KV + Send>,
 }
 
 enum AsyncMsg {
@@ -488,7 +488,7 @@ enum AsyncMsg {
 
 impl Drop for AsyncCore {
     fn drop(&mut self) {
-        let _err: Result<(), Box<std::error::Error>> = {
+        let _err: Result<(), Box<dyn std::error::Error>> = {
             || {
                 if let Some(join) = self.join.lock()?.take() {
                     let _ = self.get_sender()?.send(AsyncMsg::Finish);