update imagemin plugins

Author: NewFuture

package.json

@@ -75,9 +75,9 @@
         "rollup-plugin-typescript": "^1.0.0",
         "rollup-plugin-commonjs": "^10.0.0",
         "rollup-plugin-node-resolve": "^5.0.0",
-        "imagemin-gifsicle": "^6.0.1",
+        "imagemin-gifsicle": "^7.0.0",
         "imagemin-jpegtran": "^7.0.0",
-        "imagemin-optipng": "^7.0.0",
+        "imagemin-optipng": "^8.0.0",
         "imagemin-svgo": "^8.0.0"
     },
     "peerDependencies": {