GitHub PR images comparer

If you are like me and don't like to play "Find 5 differences" in your GitHub PR images, then this extension is just for you. Because: - It adds additional image comparer to the GitHub PR file preview that shows what pixels changed so you can easily spot the difference. - You can open original, changed and diff images in a preview dialog for better comparison. - There is also settings menu that allows you to make this comparer as a default one and change the threshold. Changelog 0.4.0 - 2022-05-01 - 💄 Private repos support! - 🐛 Fixed images stretching in width. - 🐛 Fixed page changes detection in order to show diffs when page changes. 0.3.0 - 2022-04-27 - 💄 Using `IntersectionObserver` to only load images when they are almost in the viewport - 🐛 Doing nothing in private repos as we don't know how to handle them 0.2.1 - 2022-04-18 - 🐛 Showing diffs in any commit inside PR. - 🐛 Making the extension work with most popular images extensions. 0.2.0 - 2022-04-18 - 💄 Showing diff images for between changes inside the PR. - 💄 Added dialog animation.