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Same as fmt.Errorf but with stack trace.

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# Annotation with stack trace for go1.13

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Go 1.13 contains support for [error wrapping](https://blog.golang.org/go1.13-errors). Now you can add additional information to an error by wrapping it using the new `%w` verb at `fmt.Errorf` and examine such errors using `errors.Is` and `errors.As`. If you also want to save a stack trace of an error instead of `fmt.Errorf` use `stack.Errorf` which is compatible with `errors.Is` and `errors.As` and also gives the ability to get a stack trace of the error using `stack.Trace` function which will return `[]runtime.Frame`.

* **Import**.

``` go
import "github.com/romanyx/stack
```

* **Annotate error**.

``` go
func example() error {
	if err := call(); err != nil {
		return stack.Errorf("call: %w", err)
	}

return nil
}
```

* **Print original error**.

``` go
stack.Origin(err)
```

* **Iterate through stack trace**.

``` go
for _, frame := range stack.Trace(err) {
	fmt.Printf("%s:%d %s()\n", frame.File, frame.Line, frame.Function)
}
```

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