Fill in torrent magnet link for 0.20.0

Tree-SHA512: 43e89ad585ff4917a96f38e4685a0d8756acb76bfcae63e9d6414ccbcf1ee3260c168fbef15801fcfc13c23f3e1154cf9dbdaeb4abf0ab37de7b68f92126b7e2

Author: laanwj

_releases/0.20.0.md

@@ -15,7 +15,7 @@ release: [0, 20, 0]
 ## and run: transmission-show -m <torrent file>
 #
 ## Link should be enclosed in quotes and start with: "magnet:?
-#optional_magnetlink: "magnet:?xt=urn:btih:8b6ad1da5bbb24656234efc2370abc14781a6f83&dn=bitcoin-core-0.19.1&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969"
+optional_magnetlink: "magnet:?xt=urn:btih:1845a0c66b6a728e183b9bd8c5d8c1611dddaaa3&dn=bitcoin-core-0.20.0&tr=https%3A%2F%2Fopenbittorrent.com%2F&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969"
 
 # Note: it is recommended to check all links to ensure they use
 #       absolute urls (https://github.com/bitcoin/bitcoin/doc/foo)