Adapt Guardfile to support nanoc-cli >= 4.14.7 by handling removed reps kwarg.

Author: Michiel-VandeVelde

bin/template/Guardfile

@@ -1,3 +1,10 @@
+# guard-nanoc 2.1.x passes `reps: []` to FileActionPrinter.new, but
+# nanoc-cli >= 4.14.7 removed that parameter. Absorb the stale kwarg.
+require 'nanoc/cli'
+::Nanoc::CLI::CompileListeners::FileActionPrinter.prepend(Module.new do
+  def initialize(**); super(); end
+end)
+
 guard 'rack', :port => 3000 do
   watch 'Gemfile.lock'
 end