README: update Restbed dependency informations

README.md

@@ -91,7 +91,7 @@ for r in results:
 - msgpack-c 1.2+, used for data serialization.
 - GnuTLS 3.3+, used for cryptographic operations.
 - Nettle 2.4+, a GnuTLS dependency for crypto.
-- (optional) restbed 4.0+, used for the REST API.
+- (optional) restbed used for the REST API. commit fb84213e170bc171fecd825a8e47ed9f881a12cd (https://github.com/AmarOk1412/restbed/tree/async_read_until)
 - (optional) jsoncpp 1.7.4-3+, used for the REST API.
 - Build tested with GCC 4.8+ (GNU/Linux, Android, Windows with MinGW), Clang/LLVM (Linux, macOS).
 - Build tested with Microsoft Visual Studio 2015