Fix image filename lookups for default emoji.

"Default emoji" == emoji that can be modified with skin tone modifiers.

Author: wearhere

lib/emoji/extractor.rb

@@ -23,6 +23,12 @@ def extract!
         hexes = ttf_name.split('_').map { |n| n.gsub(/^u/, '').downcase }
 
         if emoji_char_codes.include?(hexes.first.to_i(16))
+          # When an emoji supports skin-tone modifiers, all variants--including
+          # the unmodified "base" emoji--are suffixed with a "." + a number:
+          # 0 for the base, then 1-5 which maps to Fitzpatrick types 2-6
+          # (https://en.wikipedia.org/wiki/Fitzpatrick_scale). We remove the
+          # base's suffix to fix its lookups.
+          hexes.last.gsub!(/\.0$/, '')
           filename = "#{hexes.join('-')}.#{bitmap.type}"
           File.write(images_path.join(filename), bitmap.data.read)
         end