Update version to 3.0.0

Author: guanzhi

include/gmssl/version.h

@@ -24,7 +24,7 @@ Version Public API
 */
 
 #define GMSSL_VERSION_NUM	30000
-#define GMSSL_VERSION_STR	"GmSSL 3.0.0 Beta"
+#define GMSSL_VERSION_STR	"GmSSL 3.0.0"
 
 int gmssl_version_num(void);
 const char *gmssl_version_str(void);