fix readme links

Signed-off-by: William Casarin <jb55@jb55.com>

README.md

@@ -3,6 +3,8 @@
 
 A twitter-like [nostr](nostr) client for iPhone, iPad and MacOS.
 
+[nostr]: https://github.com/fiatjaf/nostr
+
 ## Spec Compliance
 
 damus implements the following [Nostr Implementation Possibilities](nips)
@@ -12,15 +14,15 @@ damus implements the following [Nostr Implementation Possibilities](nips)
 - [NIP-10: Reply conventions](nip10)
 - [NIP-12: Generic tag queries (hashtags)](nip12)
 
-## Contributing
-
-Contributors welcome! [Email patches](git-send-email) to jb55@jb55.com are preferred, but I accept PRs on github as well.
-
-[nostr]: https://github.com/fiatjaf/nostr
-[git-send-email]: http://git-send-email.io
 [nips]: https://github.com/nostr-protocol/nips
 [nip01]: https://github.com/nostr-protocol/nips/blob/master/01.md
 [nip08]: https://github.com/nostr-protocol/nips/blob/master/08.md
 [nip10]: https://github.com/nostr-protocol/nips/blob/master/10.md
 [nip12]: https://github.com/nostr-protocol/nips/blob/master/12.md
 
+## Contributing
+
+Contributors welcome! [Email patches](git-send-email) to jb55@jb55.com are preferred, but I accept PRs on github as well.
+
+[git-send-email]: http://git-send-email.io
+