escape new lines in filename

[yokrysty]

hello, first of all nice work, very useful tool

I had encountered an error when dtb_filename would contain new line (\n)

i did a simple fix of replacing that char with nothing, but maybe you would want to do more sanitization than this, for other illegal chars, if not you can ignore this issue

cheers

[PabloCastellano]

Fixed by #16 . Thanks!