Improve error output #4
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Currently, if
bundle.ymlis missing, the output reads something likeno such file or directory (os error 2), without stating the name of the file which is missing. This PR proposes usingthiserrorto wrapstd::io::Errorand other errors into a singleErrortype. Themainfunction is also slightly tweaked to ensure that errors are printed as text (rather thanDebug::fmt'd Rust values)