`impl Send for Connection`

src/lib.rs

@@ -2,6 +2,7 @@
 extern crate speech_dispatcher_sys;
 
 use std::ffi::{CStr, CString};
+use std::marker::Send;
 
 use speech_dispatcher_sys::*;
 
@@ -503,6 +504,9 @@ impl Connection {
 
 }
 
+unsafe impl Send for Connection {
+}
+
 impl Drop for Connection {
     fn drop(&mut self) {
         self.close();