Rakefile in metanorma-gb-1.4.1 vs Rakefile in metanorma-gb-1.4.2

@@ -1,6 +1,23 @@
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
+require 'isodoc/gem_tasks'
 
+module IsoDoc
+  module GemTasks
+    module_function
+
+    def fonts_placeholder
+      <<~TEXT
+        $bodyfont: '{{bodyfont}}';
+        $headerfont: '{{headerfont}}';
+        $monospacefont: '{{monospacefont}}';
+        $titlefont: '{{titlefont}}';
+      TEXT
+    end
+  end
+end
+
+IsoDoc::GemTasks.install
 RSpec::Core::RakeTask.new(:spec)
 
 task :default => :spec