Warnings while docker build

[bongjunj]

Step 6/7 : RUN npm install

npm WARN deprecated browserslist@2.11.3: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN deprecated bfj-node4@5.3.1: Switch to the `bfj` package for fixes and new features!
npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.

> uglifyjs-webpack-plugin@0.4.6 postinstall /code/node_modules/webpack/node_modules/uglifyjs-webpack-plugin
> node lib/post_install.js

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN vuex-rest-api@2.10.0 requires a peer of axios@0.18.x but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})