Added auto removal of expired pastas

README.MD

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+# MicroBin
+
+![Screenshot](git/index.png)
+
+MicroBin is a super tiny and simple self hosted pastebin app written in Rust. The executable is around 6MB and it uses 2MB memory (plus your pastas).
+
+Features:
+- No CSS or JS, super lightweight and simple
+- Animal names instead of random numbers for pasta identifiers
+- Automatically expiring pastas
+- Never expiring pastas
+- Listing and manually removing pastas
+
+Needed improvements:
+- Persisting pastas on disk (currently they are lost on restart)
+- Removing pasta after N reads
+- File uploads
+- URL shortening
+
+![Screenshot](git/pasta.png)