fix(package): update imagemin-pngquant to version 7.0.0

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
 	"dependencies": {
 		"faucet-pipeline-static": "^1.0.0",
 		"imagemin-mozjpeg": "~8.0.0",
-		"imagemin-pngquant": "~6.0.0",
+		"imagemin-pngquant": "~7.0.0",
 		"imagemin-svgo": "~7.0.0"
 	},
 	"devDependencies": {