Bump up yarn version from 1.3.2 to 1.10.0 to get rid of 'deprecated Buffer() constructor' warnings

[Stefie]

I just did a fresh install and I ran into this issue using Yarn v1.6.0:
yarnpkg/yarn#5477

Older versions of Yarn make use of a deprecated Buffer constructor and therefore throw a security and usability error on install:
(node:88819) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
Also see Node docs Deprecated APIs

It was fixed in Yarn 1.10.0, that's why I'd suggest to change the yarn version in engines in the package.json accordingly.

[jacogr]

Yes, been driving me crazy (for quite some time). I was not aware it has been fixed, thank you.

[jacogr]

Closed in #379 for the "next" branch, due to go live with poc-3.

[polkadot-js-bot]

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