[ANNOUNCE] NSPR 4.39 Release

[Kai Engert]

The NSPR 4.39 release is now available. The hg tag is
NSPR_4_39_RTM. The source tar file can be downloaded from
https://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v4.39/src/

NSPR 4.39 contains the following changes:

- Improved error handling in PR_CreateThread on Windows
- Cleanup and Type-cast fixes for prtime
- Remove unused prstreams C++ wrapper from NSPR
- Memory poisoning and Arena redzone fixes
- Removed emacs/vim modelines and .cvsignore files
- Added .editorconfig

For more details, please refer to the list of related bugs:
https://bugzilla.mozilla.org/buglist.cgi?resolution=FIXED&query_format=advanced&product=NSPR&target_milestone=4.39

Thanks to all contributors to this release.

Kai