macos version requirements are outdated

[imsodin]

#177 (comment)

In any case, maybe update the line in the README stating that from release v1.14.0-1 macOS 10.12 is required?

Since go1.17 (and whatever Syncthing version first used that) 10.13 is required. This info is bound to get out-of-date, so maybe just generically say that the requirement is the same of whatever the latest go version requires.

[xor-gate]

I have updated the version requirement, as most people who use the bundle don't going to dig into the golang docs so I will update the readme as necessary. I find general statement a little too broad.