Add link to libsndfile-binaries

Author: tuxu

samplerate/_samplerate_data/README.md

@@ -5,9 +5,10 @@ These are statically compiled dynamic libraries of
 
 ## DLLs for Windows (32-bit and 64-bit)
 
-The instructions follow the README of [libsndfile-binaries]. The DLLs were
-created on macOS using [MXE](http://mxe.cc) with the `build_samplerate_mxe.sh`
-script:
+The instructions follow the README of
+[libsndfile-binaries](https://github.com/bastibe/libsndfile-binaries). The DLLs
+were created on macOS using [MXE](http://mxe.cc) with the
+`build_samplerate_mxe.sh` script:
 
     git clone https://github.com/mxe/mxe.git
     ./build-samplerate.sh