fix(link): update links to latest version (old ones 404)

README.md

@@ -81,7 +81,7 @@ It is recommended to generate cryptographic keys and configure YubiKey from a se
 Download the latest image and verify its integrity:
 
 ```console
-$ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-9.7.0-amd64-xfce.iso
+$ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-9.8.0-amd64-xfce.iso
 $ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/SHA512SUMS
 $ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/SHA512SUMS.sign
 
@@ -90,14 +90,14 @@ $ gpg --verify SHA512SUMS.sign SHA512SUMS
 gpg: Good signature from "Debian CD signing key <debian-cd@lists.debian.org>" [unknown]
 [...]
 
-$ grep $(sha512sum debian-live-9.6.0-amd64-xfce.iso) SHA512SUMS
-e35dd65fe1b078f71fcf04fa749a05bfefe4aa11a9e80f116ceec0566d65636a4ac84a9aff22aa3f7a8eeb10289d0c2f54dfe7c599d8aa16663e4f9a74f3eec5 debian-live-9.6.0-amd64-xfce.iso
+$ grep $(sha512sum debian-live-9.8.0-amd64-xfce.iso) SHA512SUMS
+SHA512SUMS:befdf12c58aee561ba9705ea1aba796a6a2fbfc816b8178dd54e3646a76c459137e20b420f391231b64666fa300e2b76c73e138590fb6ff83f5b9a16ea4debf1  debian-live-9.8.0-amd64-xfce.iso
 ```
 
 Mount a USB disk and copy the image over to it:
 
 ```console
-$ sudo dd if=debian-live-9.6.0-amd64-xfce.iso of=/dev/sdc bs=4M && sync
+$ sudo dd if=debian-live-9.8.0-amd64-xfce.iso of=/dev/sdc bs=4M && sync
 ```
 
 Shut down the computer and disconnect any hard drives and unnecessary peripherals.