Change Read.me so installation is easier.

[UKFr-DIZ]

Hi,

I'd like to suggest a minor change to the installation READ.me because some of our colleagues with less IT affinity had issues installing age on windows. I'd suggest the following change:

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On Windows, Linux, macOS, and FreeBSD you can use the pre-built binaries, which are easily avaiable on our

Github Release Page

or here:

https://dl.filippo.io/age/latest?for=linux/amd64
https://dl.filippo.io/age/v1.1.1?for=darwin/arm64
...

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