Warning missing package-lock.json file.

[JeroenKnoops]

Currently there is no package-lock.json file.
This file is used to lock versions of dependencies.

This results in a WARN message stating you should add it.

 ---> c008d4cd2138
Step 3/4 : RUN npm install --production
 ---> Running in 9cde6380b3f4
npm WARN deprecated left-pad@1.3.0: use String.prototype.padStart()
npm notice created a lockfile as package-lock.json. You should commit this file.
added 54 packages from 33 contributors in 18.248s
Removing intermediate container 9cde6380b3f4
 ---> aeb402214f61
Step 4/4 : ENTRYPOINT ["node", "/lib/main.js"]
 ---> Running in f0802f57eb32