update engine flag in pandoc command

README.md

@@ -69,7 +69,7 @@ To install pandoc on Mac OS X, run `brew install pandoc`. To install it on Linux
 
 Although I didn't test it, you can probably use this on Windows, too. Both [Pandoc](http://pandoc.org/installing.html) and LaTeX can be installed on Windows (I recommend [MiKTeX](http://miktex.org/) for that) and you should be able to run makefiles on Windows through [Cygwin](https://www.cygwin.com/). If that's too much hassle, this command should do the trick in Powershell:
 
-    pandoc details.yml -o output.pdf --template=template.tex --latex-engine=xelatex
+    pandoc details.yml -o output.pdf --template=template.tex --pdf-engine=xelatex
 
 ## Available settings