Fix snow theme css extention missing

activeadmin_quill_editor.gemspec

@@ -15,5 +15,5 @@ Gem::Specification.new do |spec|
   spec.files         = `git ls-files -z`.split("\x0")
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'activeadmin', '~> 1.0'
+  spec.add_runtime_dependency 'activeadmin', '2.0.0.alpha' # '~> 1.0'
 end

app/assets/stylesheets/activeadmin/_quill_editor_input.sass

@@ -1,4 +1,4 @@
-@import 'activeadmin/quill_editor/quill.snow'
+@import 'activeadmin/quill_editor/quill.snow.css'
 
 body.active_admin form .quill-editor
   display: inline-block