Fix rubocop errors

Author: mfinelli

lib/bankrupt.rb

@@ -167,7 +167,7 @@ def asset_html(path, cdn, local, options = nil)
   # @param options [Hash] the options has to convert
   # @return [String] concatenated options suitable for use in lookups
   def options_string(options)
-    return nil if Hash(options).size.zero?
+    return nil if Hash(options).empty?
 
     options.map do |k, v|
       [k.to_s, v.to_s].join
@@ -182,7 +182,7 @@ def options_string(options)
   def actual_options?(options)
     return false if options.nil?
 
-    if (options.is_a?(String) || options.is_a?(Hash)) && !options.size.zero?
+    if (options.is_a?(String) || options.is_a?(Hash)) && !options.empty?
       true
     else
       false

lib/bankrupt/tasks.rb

@@ -29,7 +29,7 @@
     s3 = Aws::S3::Client.new(region: 'eu-west-1')
 
     JSON.parse(File.read(File.join(APP_ROOT, 'tmp', 'assets.json')),
-               symbolize_names: true).each do |_key, asset|
+               symbolize_names: true).each_value do |asset|
       r = s3.put_object(
         bucket: CDN_BUCKET,
         key: if asset[:hashless]