Allow to work without plugins

[ai]

postcss-cli could be very useful to convert SugarSS to CSS or CSS to SugarSS.

But I got error:

postcss -p sugarss test.sss -o test.css
Usage: /home/ai/test/node_modules/.bin/postcss [--use|-u] plugin [--config|-c
config.json] [--output|-o output.css] [input.css]

…

Please specify at least one plugin name.

[ai]

@watilde we could miss plugins count check if user set parser or stringifier

[ai]

@watilde any thoughts? Do you need PR? Say something ;)

[RyanZim]

@watilde bump, bump

[watilde]

I apologize for my late late response to all! I totally agreed with this change so I will create a patch.

[watilde]

This is fixed by v2.6.0! Please try it with new version: npm i -g postcss-cli.