Use main swift-snapshot repo.

[BjornRuud]

The fork isn't necessary anymore as the main repo has been updated with a perceptual precision parameter for the diff.

[bstien]

Yes, but Metal (GPU) is required to use that, which we don't have on Travis/CircleCI. If Metal is not available the tests will always succeed, even when it shouldn't.

We need something like this PR to be merged before we can switch away from the fork:
pointfreeco/swift-snapshot-testing#666

[BjornRuud]

Fork is necessary, will find and change the places that are not using the fork.

[adriansergheev]

Yes, but Metal (GPU) is required to use that, which we don't have on Travis/CircleCI. If Metal is not available the tests will always succeed, even when it shouldn't.

We need something like this PR to be merged before we can switch away from the fork: pointfreeco/swift-snapshot-testing#666

this seems to be kept updated with the latest main from maintainers
https://github.com/Frameio/swift-snapshot-testing/tree/non-metal-image-comparison

the one used used now is 80 commits behind
@BjornRuud