New ldc release 0.13.0
Merge pull request #5 from redstar/ldc2-0.13.0

New ldc release 0.13.0
Run eselect dlang on (un)merge of ldc2 and dmd, to set compiler symlinks
Remove "run eselect dlang" bullet point from TODO

"eselect dlang update ..." is now run on (un)installation of dmd and ldc2