rawrtc-terminal-demo can't complie success

[lxlenovostar]

I complie rawrtc-0.5.1 first. And I complie rawrtc-terminal-demo and find some errors, for example:

In file included from /home/lix/lix/rawrtc/rawrtc-terminal-demo-master/c/src/helper/parameters.c:3:0:
/home/lix/lix/rawrtc/rawrtc-terminal-demo-master/c/src/helper/parameters.c:143:13: warning: implicit declaration of function ‘rawrtc_dtls_parameters_fingerprint_get_sign_algorithm’; did you mean ‘rawrtc_dtls_fingerprint_get_sign_algorithm’? [-Wimplicit-function-declaration]
         EOE(rawrtc_dtls_parameters_fingerprint_get_sign_algorithm(&sign_algorithm, fingerprint));

rawrtc_dtls_parameters_fingerprint_get_sign_algorithm is remove form rawrtc-0.4.0

[lgrahl]

This demo needs updating. Let's track this in #21.