signal: Fix deprecated use of Handle::current (#981)

tokio-signal/src/lib.rs

@@ -102,7 +102,7 @@ pub type IoStream<T> = Box<Stream<Item = T, Error = io::Error> + Send>;
 /// read up on the documentation in the `unix` or `windows` module to take a
 /// peek.
 pub fn ctrl_c() -> IoFuture<IoStream<()>> {
-    ctrl_c_handle(&Handle::current())
+    ctrl_c_handle(&Handle::default())
 }
 
 /// Creates a stream which receives "ctrl-c" notifications sent to a process.

tokio-signal/src/unix.rs

@@ -351,7 +351,7 @@ impl Signal {
     /// * If the signal is one of
     ///   [`signal_hook::FORBIDDEN`](https://docs.rs/signal-hook/*/signal_hook/fn.register.html#panics)
     pub fn new(signal: c_int) -> IoFuture<Signal> {
-        Signal::with_handle(signal, &Handle::current())
+        Signal::with_handle(signal, &Handle::default())
     }
 
     /// Creates a new stream which will receive notifications when the current