Advertise rust-demangle.c

README.md

diff --git a/README.md b/README.md
index 0833e1e..e1a227d 100644
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+++ b/README.md
@@ -30,6 +30,9 @@
 platform). These objects implement the interface specified in
 `crates/capi/include/rustc_demangle.h`.
 
+Alternatively, there's a pure C99 implementation of Rust demangling here: 
+[rust-demangle.c](https://github.com/LykenSol/rust-demangle.c). 
+
 # License
 
 This project is licensed under either of