Bump namespace to 04
diff --git a/src/cxx_string.rs b/src/cxx_string.rs
index ffd0c5c..95d560e 100644
--- a/src/cxx_string.rs
+++ b/src/cxx_string.rs
@@ -4,9 +4,9 @@
 use std::str::{self, Utf8Error};
 
 extern "C" {
-    #[link_name = "cxxbridge03$cxx_string$data"]
+    #[link_name = "cxxbridge04$cxx_string$data"]
     fn string_data(_: &CxxString) -> *const u8;
-    #[link_name = "cxxbridge03$cxx_string$length"]
+    #[link_name = "cxxbridge04$cxx_string$length"]
     fn string_length(_: &CxxString) -> usize;
 }