SABnzbd 2.3.4 changelog

SABnzbd 2.3.4 brings the following changes:

- Device hostname in hostname-verification always lowercased
- Hostnames ending in ".local" are always accepted
- URLGrabber would not always detect correct filename
- URLGrabber would ignore some successful downloads
- Always send NNTP QUIT after server-test
- Added option "--disable-file-log" to disable file-based logging
- Added CORS-header to API
- Windows: Service compatibility with Windows 10 April update
- Windows: Update Python to 2.7.15
- Windows: Update 7zip to 18.05
- macOS: Restore compatibility with El Capitan (10.11)