Add `commentstring` setting for Jinja

setlocal commentstring={#\ %s\ #}

local yd = require 'yo-dawg'

describe('File type settings', function ()

	local nvim

	before_each(function()

		nvim = yd.start()

		nvim:command 'edit test/files/sample.jinja'

	end)

	after_each(function ()

		yd.stop(nvim)

	end)

	it('contain the commentstring', function()

		local commentstring = nvim:eval('&commentstring')

		assert.are_same('{# %s #}', commentstring)

	end)

end)