Found there is no option to choose when trying to convert files (e.g. Outlook message .msg) into PDF file with Orientation of Landscape

[wenzai007]

firstly it's a great tool! And this tool solved my requirement and it's opensource code! While using it I jus found there is no option to choose when trying to convert files (e.g. Outlook message .msg) into PDF file with Orientation of Landscape, by default it is just portait orientation, sometimes it's hard to read the content as there will be content not showing fully when in portrait mode, so I think it would be better to have this feature, read the code, and added my own for a simple PR, #58

Feel free if you have any concern or suggestions. Hope this tool can get better and better.