PanDocElectron is incompatible with Pandoc

[johnblommers]

Pandoc has changed the way it accepts PDF-generating arguments. Right now PanDocElectron cannot generate PDFs.

The option --latex-engine=latex should be replaced with --pdf-engine=xelatex

[niebert]

Thank you for the comment, excuse me for late reply.

Can be fixed in https://github.com/niebert/PanDocElectron/blob/master/js/cmdpandoc.js line 88