releases: Add magnet link for 0.18.0

Author: laanwj

_releases/0.18.0.md

@@ -15,7 +15,7 @@ release: [0, 18, 0]
 ## and run: transmission-show -m <torrent file>
 #
 ## Link should be enclosed in quotes and start with: "magnet:?
-#optional_magnetlink: "magnet:?xt=urn:btih:c56c87ccfaa8e6fbccc90d549121e61efd97cb6f&dn=bitcoin-core-0.17.1&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Fzer0day.ch%3A1337&tr=udp%3A%2F%2Fexplodie.org%3A6969"
+optional_magnetlink: "magnet:?xt=urn:btih:a25c86ffa7a512b6d074287f74762b77f91cef4c&dn=bitcoin-core-0.18.0&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Fzer0day.ch%3A1337&tr=udp%3A%2F%2Fexplodie.org%3A6969"
 
 # Note: it is recommended to check all links to ensure they use
 #       absolute urls (https://github.com/bitcoin/bitcoin/doc/foo)