Clarify csv path

[michielmulders]

It's not clear you have to define the csv path from the root of your project.
Please add this to the documentation.

[coveralls]

Pull Request Test Coverage Report for Build 183

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 95.12%

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Files with Coverage Reduction	New Missed Lines	%
src/util.ts	1	33.33%

Totals
Change from base Build 182:	0.0%
Covered Lines:	640
Relevant Lines:	656

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💛 - Coveralls

[Keyang]

The relative file path is relative to your current working directory of your process.
Thus it is not really related to your project folder if you do not start your node.js process from your project folder. e.g.

cd /root
node /opt/mynodeapp/index.js

In example above, the cwd will be /root and the filepath are all related to /root
~Keyang