add nvmrc file

[frankiebee]

currently web3js will not successfully install deps with node version 15~ and npm version 7

please feel free to debate the node version am very willing to change this

or weather we should specify in package.json file

[coveralls]

Coverage increased (+2.4%) to 80.423% when pulling dfa8663 on safe-dev/create-nvmrc into 27c9679 on 1.x.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ spacesailor24
❌ frankiebee
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[coveralls]

Pull Request Test Coverage Report for Build 659139631

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.265%

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Totals
Change from base Build 659138699:	0.0%
Covered Lines:	3170
Relevant Lines:	3942

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💛 - Coveralls

[spacesailor24]

I've tested installing web3 as a dependency using node 15.5.1, and it works fine. However, installing the devDependencies with version 15.5.1 is broken, so I think adding the .nvmrc file with version 14.15.1 makes sense for developers of web3

[koraykoska]

Tested it and works for me.

[spacesailor24]

Needs changelog update :)

[render]

Your Render PR Server URL is https://web3-js-pr-3817.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c18ir0jjbvm4ohludhe0.