Use dyn Trait syntax

The plain Trait syntax is no longer recommended as this is
clearer.
1 files changed, 1 insertions(+), 1 deletions(-)

M src/dbus.rs
M src/dbus.rs +1 -1
@@ 640,7 640,7 @@ pub enum ClientErrorKind {
 }
 
 impl failure::Fail for ClientError {
-    fn cause(&self) -> Option<&failure::Fail> {
+    fn cause(&self) -> Option<&dyn failure::Fail> {
         self.inner.cause()
     }