Dev 1.6.7 as Next Stable Release

[ExtremeFiretop]

Forms post update = READY
Readme update = COMPLETED
Version.txt update = COMPLETED

Dev 1.6.7 as Next Stable Release

What's Changed/Fixed?:

PR: [ #594 ] - Implement TLC Feedback and Razor Feedback

• Silenced the Cron job hook check from the syslogs when AMTM executes MerlinAU for an update check.
• Thanks to thelonelycoder for the report
• See the report here on SNBforums here: https://www.snbforums.com/threads/merlinau-v1-6-6-the-ultimate-firmware-auto-updater.96306/post-1002422
• Implemented an automated checksum mirror on the MerlinAU github with a 15 minute update interval, to workaround RMerlins website provider blocking countries (brazil, turkey) for some users.
• Thanks to @Razor221 for the report
• See the reported issue on Github here: [REQ] - If online checksum check fails fallback to using offline checksum check #593
• See @RMerl posts on the discussion here: https://www.snbforums.com/threads/asus-merlin-site-down.97648/post-999566

PR: [ #595 ] - Error Checking/Reporting When Fetching F/W Signatures

• Improved error checking and reporting when downloading F/W image signatures from RMerlin's website. This allows users to see when the failure to download the checksum signatures may be due to their IP address currently being banned from accessing the website server [HTTP error code 403].
• Miscellaneous improvements.
• (Thanks @Martinski4GitHub )

As always, we highly recommend you update ASAP as this includes functional improvements and little bug fixes.
Thanks!