add maintenance note

readme.md

@@ -2,6 +2,22 @@
 
 sus URL shortener
 
+## maintenance notice
+
+for my personal use i have replaced sus with the simpler [urls-txt](https://pls.cx/urls-txt).
+
+i likely won't be updating sus anymore,
+but this program is simple so i doubt it'll stop working
+and i haven't really updated it much anyway,
+since it did everything i wanted.
+
+i'll update the dependencies every now and then but i have forgotten golang in the four years
+between writing it and now.
+
+if you want to use it instead of [urls-txt](https://pls.cx/urls-txt),
+go ahead.
+i'll update the dependencies every now and then.
+
 
 ## `susmng` usage (managing shortlinks)