Fix issues in Parsing ID3 Metadata in Elixir

site/posts/2020-02-18-simple-swift-promises.md

@@ -178,7 +178,7 @@ public extension Promise {
 		addHandler { (parentResult) in
 			let newPromise = mapper(parentResult)
 			newPromise.addHandler(next.resolve)
-			newPromise.addHandler(next.reject)
+			newPromise.addCatcher(next.reject)
 		}
 		addCatcher(next.reject)
 		return next

site/posts/2020-12-07-parsing-id3-tags.md

@@ -238,6 +238,7 @@ def parse_frames(
         _encryption::size(1),
         _unsynchronized::size(1),
         _has_data_length_indicator::size(1),
+		_unused::size(1),
         rest::binary
       >>,
       tag_length_remaining,
@@ -411,7 +412,7 @@ There are also the many, many frames which we have not specifically handled. Eve
 ```elixir
 def decode_frame(id, frame_size, rest) do
   cond do
-    Regex.match?(~r/^T[0-9A-Z]$/, id) ->
+    Regex.match?(~r/^T[0-9A-Z]+$/, id) ->
 	  decode_text_frame(id, frame_size, rest)
 
 	id in @declared_frame_ids ->