LDC 1.13.0-beta2

[kinke]

Glad to announce the second beta for LDC 1.13:

* Based on D 2.083.0+ (yesterday's DMD stable).
* The Windows packages are now fully self-sufficient, i.e., a 
Visual Studio/C++ Build Tools installation isn't required anymore.
* Substantial debug info improvements.
* New command-line option `-fvisibility=hidden` to hide 
functions/globals not marked as export, to reduce the size of 
shared libraries.

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.13.0-beta2

Thanks to all contributors!