remove unneeded puppeteer dependency

package.json

@@ -38,7 +38,6 @@
     "log4js": "^6.3.0",
     "playwright": "^1.9.1",
     "pngjs": "^5.0.0",
-    "puppeteer": "^2.1.0",
     "read-all-stream": "^3.1.0",
     "sha1": "^1.1.1",
     "sharp": "^0.25.4",