dl: add go1.13.1 and go1.12.10

Fixes golang/go#34550

Change-Id: Ia3329d04b7409014a8b47e99192c3d3a21bac844
GitHub-Last-Rev: 39a600b99cc5d92b2625fa8ada51d91581ca84ca
GitHub-Pull-Request: golang/dl#4
Reviewed-on: https://go-review.googlesource.com/c/dl/+/197457
Reviewed-by: Filippo Valsorda <filippo@golang.org>
2 files changed