v0.4.1

Add newf for formatting fundamental/root errors.

Rename subpackages

See #5 for rationale

• renamed errctx to fctx
• renamed kind to ftag
• renamed issue to fmsg and removed fault.Msg built-in functionality, users can just use fmsg now as it does the same thing

So now if you want to use all the included utilities, it's a little less noisy:

    return fault.Wrap(err,
        fctx.With(ctx),
        ftag.With(ftag.NotFound),
        fmsg.With("failed to do something"),
    )

and since everything starts with f and gopls can filter suggestions based on what you've already typed and the expected type (which is func(error) error`) then you can very easily find and use the built-ins.

Error utilities

Split the functionality into simpler sub packages. No more stack traces, no more messages. pkg/errors already does this.

• Added errctx for bridging the gap between context and errors.
• Added errmeta which includes the core functionality of the original fault code
• Added errtag which allows tagging errors with well defined types