[trivial] BIP-69: Update reference [1] link to bitcoinmagazine.com #815

1. 
   0xB10C commented at 3:18 pm on July 29, 2019: none

   The previous link for reference [1] was broken. A new link to the same article fixes this.
2. Update reference link [1] to bitcoinmagazine.com

   The [previous link](https://bitcoinmagazine.com/20273/bitstamp-exchange-activity-trackable-due-multisig-wallet-implementation) for reference [1] was broken. The new link is https://bitcoinmagazine.com/articles/bitstamp-exchange-activity-trackable-due-multisig-wallet-implementation-1430860151.

   8a5884d8a8
3. 
   0xB10C commented at 5:21 pm on August 10, 2019: none

   Contacted editor via the provided email a few days ago. No response yet.
4. 
   luke-jr commented at 10:10 pm on September 19, 2019: member

   @dcousens
5. luke-jr added the label Proposed BIP modification on Sep 19, 2019
6. 
   luke-jr commented at 10:10 pm on September 19, 2019: member

   (Neither link seems to work for me / without Javascript…)
7. 
   0xB10C commented at 12:41 pm on January 7, 2020: none

   The original bitcoinmagazine link seems to be redirected correctly now. This PR is not needed anymore.
8. 0xB10C closed this on Jan 7, 2020

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9. 0xB10C deleted the branch on Jan 7, 2020

Contributors
0xB10C luke-jr

Labels
Proposed BIP modification