How to update core-js to core-js@3 dependency? : <p>While I was trying to install and setup react native, the precaution observed about the core-js version as update your core-js@... to core-js@3 But don't know how to update my core-js.</p>

<pre><code>$ sudo react-native init AwesomeProject121
Password:
This will walk you through creating a new React Native project in /Users/amarnr1989/AwesomeProject121
Using yarn v1.13.0
Installing react-native...
yarn add v1.13.0
info No lockfile found.
[1/4] 🔍  Resolving packages...
warning react-native &gt; create-react-class &gt; fbjs &gt; core-js@1.2.7: core-js@&lt;2.6.5 is no longer maintained. Please, upgrade to core-js@3 or at least to actual version of core-js@2.
[2/4] 🚚  Fetching packages...
[----------------------------------------------------------------------------------------------------------------------------------------------------------] 0/601internal/modules/cjs/loader.js:584
    throw err;
    ^

Error: Cannot find module '/Users/amarnr1989/AwesomeProject121/node_modules/react-native/package.json'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
    at Function.Module._load (internal/modules/cjs/loader.js:508:25)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at checkNodeVersion (/usr/local/lib/node_modules/react-native-cli/index.js:306:21)
    at run (/usr/local/lib/node_modules/react-native-cli/index.js:300:3)
    at createProject (/usr/local/lib/node_modules/react-native-cli/index.js:249:3)
    at init (/usr/local/lib/node_modules/react-native-cli/index.js:200:5)
    at Object.&lt;anonymous&gt; (/usr/local/lib/node_modules/react-native-cli/index.js:153:7)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
</code></pre>

<p>Please Suggest </p>
