An ACME Order object can contain an error field when it is invalid. Previously, OrderError.Error() ignored this field, making it difficult to diagnose why an order failed. This change includes the problem details if available. Change-Id: I461fd02ef02251a2ba1e8cea39b5df8070938117 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/772880 Reviewed-by: Roland Shoemaker <roland@golang.org> Reviewed-by: Sean Liao <sean@liao.dev> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>