Change example filename of report-file at USAGE

[zxzl]

Currently, example filename is report.txt but actually it is stored as an Excel file.
Why don't we change it to Excel file to prevent misunderstanding?

[felipead]

Hi @zxzl. My apologies for this confusion. The project is still at early stage. But you're absolutely right.

The plan is to make the command-line to receive flags to allow either plain-text or excel report to be generated at the users will.

I will fix this shortly.

[zxzl]

Aha, I tried this one and it ran pretty well so I thought it's finished project. Thanks for sharing! It will be useful especially when developing commercial projects :D