Fix macOS build

Author: kazk

src/imp/security_framework.rs

@@ -423,6 +423,7 @@ impl<S: io::Read + io::Write> TlsStream<S> {
         Ok(self.stream.context().buffered_read_size()?)
     }
 
+    #[allow(deprecated)]
     pub fn peer_certificate(&self) -> Result<Option<Certificate>, Error> {
         let trust = match self.stream.context().peer_trust2()? {
             Some(trust) => trust,

src/test.rs

@@ -186,7 +186,10 @@ fn peer_certificate() {
     let socket = p!(builder.connect("localhost", socket));
 
     let cert = socket.peer_certificate().unwrap().unwrap();
-    assert_eq!(cert.to_der().unwrap(), keys.client.ca.get_der());
+    assert_eq!(
+        cert.to_der().unwrap(),
+        keys.server.cert_and_key.cert.get_der()
+    );
 
     p!(j.join());
 }