update TODO

TODO.md

@@ -5,10 +5,12 @@
 * network
   * open socket with so_reuseport and nonblocking
   * handshake: deregister stream when applicable
+  * connection cleaning: shrink to fit
 * test
 * torrent state cleaning
 * config
 * limit number of info hashes allowed in scrape requests
+* cli, mimalloc
 
 ## aquatic
 * mio: set oneshot for epoll and kqueue? otherwise, stop reregistering?