Add pngquant version 2.11.7 (#2112)

bucket/pngquant.json

@@ -0,0 +1,15 @@
+{
+    "homepage": "https://pngquant.org/",
+    "description": "A command-line utility for lossy compression of PNG images",
+    "license": "GPL",
+    "version": "2.11.7",
+    "hash": "2ec61729baeec7b0f1d7c11b5444d0419362b4ddfe2fc1f8d010710e71e2815b",
+    "url": "https://pngquant.org/pngquant-windows.zip",
+    "bin": "pngquant\\pngquant.exe",
+    "checkver": {
+        "github": "https://github.com/kornelski/pngquant"
+    },
+    "autoupdate": {
+        "url": "https://pngquant.org/pngquant-windows.zip"
+    }
+}