Update appveyor readme

readme.txt

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 Go to the [GitHub Site](https://slashiee.github.io/cemu_graphic_packs/) for more information.
 
 Please delete any current graphics packs that you are going to replace! This is necessary if, for example, any shader edits in an older installed version are deleted from a pack in a future downloaded version.
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+Contributors:
+slashiee - 416 commits: 117,760 line additions and 131,297 line deletions.
+getdls - 31 commits: 30,136 line additions and 1,317 line deletions.
+Darkemaste - 23 commits: 14,684 line additions and 747 line deletions.
+JoelAlone - 17 commits: 22,529 line additions and 1,797 line deletions.
+NAVras-Z - 16 commits: 32,854 line additions and 14,979 line deletions.
+alexkiri - 13 commits: 18,432 line additions and 17,262 line deletions.
+Crementif - 9 commits: 18,831 line additions and 14,792  line deletions.
+Xalphenos - 6 commits: 312 line additions and 36 line deletions.
+rajkosto - 6 commits: 503 line additions and 6 line deletions.
+SwooshyCueb - 2 commits: 851 line additions and 990 line deletions.
+runderscore - 1 commit: 21 line additions and 3 line deletions.
+riperiperi - 1 commit: 103 line additions and 22 line deletions.
+tails101 - 1 commit: 10 line additions and 0 line deletions.
+Keelhauled - 1 commit: 99 line additions and 0 line deletions.