message: update block explorer links
diff: @@ -26,8 +26,8 @@ Basic usage resources:
  * [Unofficial Qtum staking tutorial on Raspberry Pi](https://steemit.com/qtum/@cryptominder/qtum-staking-tutorial-using-qtumd-on-a-raspberry-pi-3)
  * [Unofficial Qtum staking tutorial on AWS EC2](https://github.com/aaronmboyd/qtum-staking-on-aws-ec2)
  * [Unofficial guide for keeping your wallet safe](https://steemit.com/qtum/@cryptominder/encrypting-backing-up-and-restoring-your-qtum-wallet)
  -* [Block explorer](https://explorer.qtum.org)
  -* [Unofficial block explorer](https://qtumexplorer.io/)
  +* [Block explorer](https://qtum.info/)
  +* [Alternative block explorer](https://explorer.qtum.org/)
  Development resources:
  