add support for custom demangler

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Protect the error number in signal handler (#128)
+- Support custom demangler (#126)
 
 ## [0.9.0] - 2022-05-09
 

src/frames.rs

@@ -106,8 +106,8 @@ impl Symbol {
         self.raw_name.as_deref().unwrap_or(b"Unknown")
     }
 
-    pub fn name(&self) -> &str {
-        self.name.as_deref().unwrap_or("Unknown")
+    pub fn name(&self) -> String {
+        self.name.as_deref().unwrap_or("Unknown").to_string()
     }
 
     pub fn sys_name(&self) -> Cow<str> {