No spaces in filetype are crucial for MD files

at least mentioned now in README

This really puzzled me and blocked me from making a presentation for more than 20 minutes untill I made a careful comparison between working example and non-working one. :-)

I'd like to improve this and make same for other formats and Vim docs, but I don't know them enough to check my work prior to submitting. Can you point me or direct me which checks would be enough? Or are you willing to port this yourself?