handlebars_assets.gemspec in handlebars_assets-0.9.0 vs handlebars_assets.gemspec in handlebars_assets-0.10.0

@@ -21,6 +21,7 @@
   s.add_runtime_dependency "execjs", ">= 1.2.9"
   s.add_runtime_dependency "tilt"
   s.add_runtime_dependency "sprockets", ">= 2.0.3"
   s.add_development_dependency "rake"
   s.add_development_dependency "haml"
+  s.add_development_dependency "slim"
 end