[dev.boringcrypto] misc/boring: add go1.13.7b4 and go1.12.16b4 releases to RELEASES file
[dev.boringcrypto] misc/boring: add go1.13.7b4 and go1.12.16b4 releases to RELEASES file

Fixes #36611

Change-Id: Ie216914a044d02afbe9d9c36c4597f84282dae89
Reviewed-on: https://go-review.googlesource.com/c/go/+/217938
Reviewed-by: Katie Hockman <e321a8fd89c4908465ddaf8d5d0d62480efacb63@golang.org>

nawawi/go,nawawi/go,golang/go,nawawi/go,nawawi/go,nawawi/go,golang/go,golang/go,golang/go,golang/go,golang/go,nawawi/go,nawawi/go,golang/go,nawawi/go,golang/go