adding cert on android print error instead of crash

Now when load_android_root_certs failed, it'll print error
instead of return error.

Author: edelangh

src/imp/openssl.rs

@@ -102,7 +102,9 @@ fn load_android_root_certs(connector: &mut SslContextBuilder) -> Result<(), Erro
             .filter_map(|e| fs::read(e.path()).ok())
             .filter_map(|b| X509::from_pem(&b).ok());
         for cert in certs {
-            connector.cert_store_mut().add_cert(cert)?;
+            if let Err(err) = connector.cert_store_mut().add_cert(cert) {
+                eprintln!("load_android_root_certs error: {:?}", err);
+            }
         }
     }