chore: update app headers [skip ci]

Author: github-actions[bot]

ct/headers/rsshub

@@ -0,0 +1,6 @@
+    ____  __________ __  __      __  
+   / __ \/ ___/ ___// / / /_  __/ /_ 
+  / /_/ /\__ \\__ \/ /_/ / / / / __ \
+ / _, _/___/ /__/ / __  / /_/ / /_/ /
+/_/ |_|/____/____/_/ /_/\__,_/_.___/ 
+