refine core macros

@@ -44,7 +44,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define RTMP_SIG_SRS_LICENSE "The MIT License (MIT)"
 #define RTMP_SIG_SRS_COPYRIGHT "Copyright (c) 2013-2014 winlin"
 #define RTMP_SIG_SRS_PRIMARY_AUTHROS "winlin,wenjie.zhao"
-#define RTMP_SIG_SRS_CONTRIBUTORS_URL "https://github.com/winlinvip/simple-rtmp-server/blob/master/AUTHORS.txt"
+#define RTMP_SIG_SRS_CONTRIBUTORS_URL RTMP_SIG_SRS_URL"/blob/master/AUTHORS.txt"
 
 /**
 * the core provides the common defined macros, utilities,