change highlighter to 'rouge'
change highlighter to 'rouge'

'pygments' is no longer supported.
Maciuch/maciuch.github.io,janekmi/janekmi.github.io,krzycz/krzycz.github.io,Maciuch/maciuch.github.io,krzycz/krzycz.github.io,janekmi/janekmi.github.io