Update vendor (#1414)

vendor/github.com/magefile/mage/sh/helpers.go

@@ -0,0 +1,40 @@
+package sh
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+// Rm removes the given file or directory even if non-empty. It will not return
+// an error if the target doesn't exist, only if the target cannot be removed.
+func Rm(path string) error {
+	err := os.RemoveAll(path)
+	if err == nil || os.IsNotExist(err) {
+		return nil
+	}
+	return fmt.Errorf(`failed to remove %s: %v`, path, err)
+}
+
+// Copy robustly copies the source file to the destination, overwriting the destination if necessary.
+func Copy(dst string, src string) error {
+	from, err := os.Open(src)
+	if err != nil {
+		return fmt.Errorf(`can't copy %s: %v`, src, err)
+	}
+	defer from.Close()
+	finfo, err := from.Stat()
+	if err != nil {
+		return fmt.Errorf(`can't stat %s: %v`, src, err)
+	}
+	to, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, finfo.Mode())
+	if err != nil {
+		return fmt.Errorf(`can't copy to %s: %v`, dst, err)
+	}
+	defer to.Close()
+	_, err = io.Copy(to, from)
+	if err != nil {
+		return fmt.Errorf(`error copying %s to %s: %v`, src, dst, err)
+	}
+	return nil
+}