Timestamp reports

[osmolyar]

Is your feature request related to a problem? Please describe.
Currently reports are named according to the Feature file, and overwritten each time the Feature file is run.

Describe the solution you'd like
It would be nice to have a timestamp added to the file name to keep a record of prior reports.

Describe alternatives you've considered
Something like the following

 onRunnerEnd() {
        const jsonFolder = (0, path_1.resolve)(process.cwd(), this.options.jsonFolder);
        const date = new Date().getTime()
        const jsonFile = (0, path_1.resolve)(jsonFolder, `${this.report.feature.id}_${date}.json`);
        const json = [this.report.feature];
        const output = (0, fs_extra_1.existsSync)(jsonFile) ? json.concat((0, fs_extra_1.readJsonSync)(jsonFile)) : json;
        (0, fs_extra_1.outputJsonSync)(jsonFile, output);
    }

Additional context

[osmolyar]

If acceptable, will submit a PR for this.

[wswebcreation]

Thanks for the Feature Request, if you want to can start with a PR

[osmolyar]

Submitted pull request #80