Add test for nested template literals

[TimvdLippe]

Initially I thought this package wouldn't work for nested template literals (which ChromeDevTools used). I wanted to do TDD and add the test first (since there was no test for it yet) and I discovered this use case is already covered. That's because the template.tag for MemberExpressions already includes the whole line, and thus it matches on lihtml.html, which indeed includes html.

So let's add the test to make sure this use case remains covers, but no actual code changes are required :tada:

[coveralls]

Pull Request Test Coverage Report for Build 104

• 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 83.966%

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Totals
Change from base Build 96:	0.0%
Covered Lines:	125
Relevant Lines:	135

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💛 - Coveralls

[asyncLiz]

LGTM, thanks for the PR!