make it compatible with native 'errors' package

Author: Alex Sch

native.go

@@ -0,0 +1,29 @@
+package errors
+
+import "errors"
+
+// New returns an error that formats as the given text.
+// Wraps original errors.New function to avoid importing "errors".
+func New(text string) error {
+	return errors.New(text)
+}
+
+// Is reports whether any error in err's chain matches target.
+// Wraps original errors.Is function to avoid importing "errors".
+func Is(err, target error) bool {
+	return errors.Is(err, target)
+}
+
+// As finds the first error in err's chain that matches target, and if one is found,
+// sets target to that error value and returns true. Otherwise, it returns false.
+// Wraps original errors.As function to avoid importing "errors".
+func As(err error, target interface{}) bool {
+	return errors.As(err, target)
+}
+
+// Unwrap returns the result of calling the Unwrap method on err, if err's type contains
+// an Unwrap method returning error. Otherwise, Unwrap returns nil.
+// Wraps original errors.Unwrap function to avoid importing "errors".
+func Unwrap(err error) error {
+	return errors.Unwrap(err)
+}