Return the original response in @exec-time

[masoud-msk]

This example implies that @execTime decorator doesn't change the method signature:

    @execTime()
    getData(): Promise<DataDto> {
      return this.dataProvider.getData();
    }

But it's not true. This PR is fixing this.

Addressing #171

[masoud-msk]

@vlio20 It looks like you should update the CI job.

[vlio20]

trying...

[vlio20]

@masoud-msk do you want to try and updated actions/upload-artifact: v1 ?

[masoud-msk]

@vlio20 Sorry, I don't have any experience with GitHub Actions!

[vlio20]

@masoud-msk I fixed the CI. I have few questions regarding your PR.