README: Fix typo (missing space) on Rails.application.config.dartsass.build_options #12

Job	Run time
Tests (Ruby 3.0, Gemfile)	50s
Tests (Ruby 3.0, gemfiles/rails_7_0_propshaft.gemfile)	48s
Tests (Ruby 3.0, gemfiles/rails_7_1_propshaft.gemfile)	55s
Tests (Ruby 3.0, gemfiles/rails_7_0_sprockets.gemfile)	51s
Tests (Ruby 3.0, gemfiles/rails_7_1_sprockets.gemfile)	59s
Tests (Ruby 3.1, Gemfile)	48s
Tests (Ruby 3.1, gemfiles/rails_7_0_propshaft.gemfile)	46s
Tests (Ruby 3.1, gemfiles/rails_7_1_propshaft.gemfile)	51s
Tests (Ruby 3.1, gemfiles/rails_main_propshaft.gemfile)	1m 21s
Tests (Ruby 3.1, gemfiles/rails_7_0_sprockets.gemfile)	44s
Tests (Ruby 3.1, gemfiles/rails_7_1_sprockets.gemfile)	52s
Tests (Ruby 3.1, gemfiles/rails_main_sprockets.gemfile)	1m 31s
Tests (Ruby 3.2, Gemfile)	49s
Tests (Ruby 3.2, gemfiles/rails_7_0_propshaft.gemfile)	44s
Tests (Ruby 3.2, gemfiles/rails_7_1_propshaft.gemfile)	56s
Tests (Ruby 3.2, gemfiles/rails_main_propshaft.gemfile)	1m 1s
Tests (Ruby 3.2, gemfiles/rails_7_0_sprockets.gemfile)	48s
Tests (Ruby 3.2, gemfiles/rails_7_1_sprockets.gemfile)	51s
Tests (Ruby 3.2, gemfiles/rails_main_sprockets.gemfile)	56s
Tests (Ruby 3.3, Gemfile)	58s
Tests (Ruby 3.3, gemfiles/rails_7_0_propshaft.gemfile)	53s
Tests (Ruby 3.3, gemfiles/rails_7_1_propshaft.gemfile)	57s
Tests (Ruby 3.3, gemfiles/rails_main_propshaft.gemfile)	1m 0s
Tests (Ruby 3.3, gemfiles/rails_7_0_sprockets.gemfile)	58s
Tests (Ruby 3.3, gemfiles/rails_7_1_sprockets.gemfile)	57s
Tests (Ruby 3.3, gemfiles/rails_main_sprockets.gemfile)	1m 0s
	24m 4s

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