Include commits into AUR Package Update notification emails

Current package notification emails lack details about changes.

Subject: AUR Package Update: llama.cpp

txtsd [1] pushed a new commit to llama.cpp [2].

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If you no longer wish to receive notifications about this package,
please go to the package page [2] and select "Disable notifications".

[1] https://aur.archlinux.org/account/txtsd/
[2] https://aur.archlinux.org/pkgbase/llama.cpp/

To see what was changed, one needs to open the web site and then click "View Changes" links.

It would be nice to see pushed commit directly in notification email.

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