docs: update instances list

add a new instance by lunar.icu

fix: https://github.com/zyachel/libremdb/issues/28

README.md

@@ -43,6 +43,7 @@ Inspired by projects like [teddit](https://codeberg.org/teddit/teddit), [nitter]
 | [libremdb.esmailelbob.xyz](https://libremdb.esmailelbob.xyz) | Canada | Operated by [Esmail EL BoB](https://esmailelbob.xyz) |
 | [ld.vern.cc](https://ld.vern.cc) | US | Operated by [~vern](https://vern.cc) |
 | [binge.whatever.social](https://binge.whatever.social) | US & Germany | Operated by [Whatever Social](https://whatever.social) |
+| [libremdb.lunar.icu](https://libremdb.lunar.icu/) | - | Operated by [lunar.icu](https://lunar.icu/) |
 | 2. Onion | | |
 | [libremdb.esmail5pdn24shtvieloeedh7ehz3nrwcdivnfhfcedl7gf4kwddhkqd.onion](http://libremdb.esmail5pdn24shtvieloeedh7ehz3nrwcdivnfhfcedl7gf4kwddhkqd.onion) | Canada | Operated by [Esmail EL BoB](https://esmailelbob.xyz) |
 | [ld.vernccvbvyi5qhfzyqengccj7lkove6bjot2xhh5kajhwvidqafczrad.onion](http://ld.vernccvbvyi5qhfzyqengccj7lkove6bjot2xhh5kajhwvidqafczrad.onion) | US  | Operated by [~vern](https://vern.cc) |