fixace verze sprockets

verze 4.0.0.beta9 neni kompatibilni

Gemfile

@@ -29,15 +29,15 @@ group :jekyll_plugins do
   gem "jekyll-paginate"
   gem "jekyll-sitemap"
   # gem "github-pages"
-  gem "jekyll-assets", "3.0.10"
+  gem "jekyll-assets", "3.0.11"
   gem 'jekyll-environment-variables'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 gem "json" # For gem building
-gem 'sprockets', '~> 4.0.0.beta'
+gem 'sprockets', '4.0.0.beta8'
 gem 'uglifier', '~> 4.0.0'
 gem "mini_magick"
 gem "autoprefixer-rails"