add support for print text during render progress bar #6

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10 errors

Error return value of `b.RenderBlank` is not checked (errcheck)

Error return value of `p.render` is not checked (errcheck)

Error return value of `p.Add` is not checked (errcheck)

Error return value of `io.Copy` is not checked (errcheck)

Error return value is not checked (errcheck)

Error return value of `io.Copy` is not checked (errcheck)

Error return value of `f.Sync` is not checked (errcheck)

Error return value of `r.bar.Add` is not checked (errcheck)

Error return value of `r.bar.Finish` is not checked (errcheck)

Error return value of `bar.Add` is not checked (errcheck)