feat(pkuxkx): silent 增加两个命令

plugins/silent.tin

@@ -11,7 +11,7 @@
     nation;         nation*;        ask;            i2;
     buy;            list;           node;           fullme;
     shu;            dang;           verify;         perform;
-    register;       check;
+    register;       check;          answer;         reply;
 
     amber_alert;    status_me;      set;            unset;
 };