Need to close the log file before packing when app crashed

[mooons]

Otherwise the resulting zip file will be corrupted. :(

[18:42:52.770 FTL] Exception Occurred  (at SoundSwitch.Program.HandleException)
System.IO.IOException: The process cannot access the file 'C:\Users\u\AppData\Roaming\SoundSwitch\Logs\soundswitch20200503.log' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at System.IO.Compression.ZipFileExtensions.DoCreateEntryFromFile(ZipArchive destination, String sourceFileName, String entryName, Nullable`1 compressionLevel)
   at System.IO.Compression.ZipFile.DoCreateFromDirectory(String sourceDirectoryName, String destinationArchiveFileName, Nullable`1 compressionLevel, Boolean includeBaseDirectory, Encoding entryNameEncoding)
   at SoundSwitch.Program.HandleException(Exception exception) in C:\Users\Antoine\source\repos\SoundSwitch\SoundSwitch\Program.cs:line 245
   at SoundSwitch.Program.Main() in C:\Users\Antoine\source\repos\SoundSwitch\SoundSwitch\Program.cs:line 172

(From #427 (comment))

Solution: Log.CloseAndFlush() before ZipFile.CreateFromDirectory.