fixed little typo
Merge pull request #602 from UplinkCoder/patch-1

fixed little typo
Add download links for LDC release 0.13.0
Add new version identifiers.

Epiphany was added in 2.064.2 and NVPTX/NVPTX64 in 2.066.
Merge pull request #604 from redstar/version

Add new version identifiers.
Merge pull request #603 from redstar/ldc2-0.13.0

Add download links for LDC release 0.13.0