refactor(project): require Node > 8.10

[homer0]

What does this PR do?

It updates the required version of Node to > 8.10. The reason for this is that a few "main dependencies" for the build engines now have the same requirement, and it order to keep updating them (to prevent vulnerabilities) I had to apply the same restriction.

I also fixed a typo in one of the documents :P.

How should it be tested manually?

Update the Node version, install the dependencies and...

yarn test
# or
npm test

[coveralls]

Pull Request Test Coverage Report for Build 288

• 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 100.0%

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Totals
Change from base Build 285:	0.0%
Covered Lines:	2194
Relevant Lines:	2194

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💛 - Coveralls