Add wrapper for errors.Join (#2)

Had to upgrade to Go 1.20 to add it.

errors.go

@@ -1,33 +1,38 @@
-// Package errors provides Wrap in addition to the functions in the stdlib errors package.
-// It's otherwise a drop-in replacement for the stdlib package.
+// Package errors provides [Wrap] in addition to the functions in the [errors] package.
+// It also provides [Newf] which is a wrapper around [fmt.Errorf].
 package errors
 
 import (
  "errors"
  "fmt"
 )
 
-// As calls errors.As.
+// As calls [errors.As].
 func As(err error, target interface{}) bool {
  return errors.As(err, target)
 }
 
-// Is calls errors.Is.
+// Is calls [errors.Is].
 func Is(err, target error) bool {
  return errors.Is(err, target)
 }
 
-// New calls errors.New.
+// Join calls [errors.Join].
+func Join(errs ...error) error {
+ return errors.Join(errs...)
+}
+
+// New calls [errors.New].
 func New(text string) error {
  return errors.New(text)
 }
 
-// Newf calls fmt.Errorf.
+// Newf calls [fmt.Errorf].
 func Newf(format string, a ...interface{}) error {
  return fmt.Errorf(format, a...)
 }
 
-// Unwrap calls errors.Unwrap.
+// Unwrap calls [errors.Unwrap].
 func Unwrap(err error) error {
  return errors.Unwrap(err)
 }

go.mod

@@ -1,3 +1,3 @@
 module maragu.dev/errors
 
-go 1.18
+go 1.20