chore(tests): also test with Node.js 10

[shinnn]

To test this line

v8-to-istanbul/lib/script.js

Line 12 in 920d174

const cjsWrapperLength = isNode10 ? require('module').wrapper[0].length : 0

and get 100% code coverage

[coveralls]

Pull Request Test Coverage Report for Build 54

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-3.1%) to 95.318%

---

Totals
Change from base Build 53:	-3.1%
Covered Lines:	234
Relevant Lines:	235

---

💛 - Coveralls

[bcoe]

@shinnn I don't believe Node 10 will pass until we land:

nodejs/node#27124

In Node.js, perhaps add your vote to that backport 😄

[shinnn]

Thanks for the link. Closing for now.