(fix) make read_tag skip extra padding bytes

Some WAVE files are not just padded with \0 bytes (null terminators) but
arbitrary bytes. This causes the bug outlined in dancasimiro#101 & dancasimiro#102. Instead of
looking for consecutive \0 bytes read size from CHUNK and ignore
remainder of unused data.

See dancasimiro#101, dancasimiro#102

src/WAVChunk.jl

@@ -217,17 +217,14 @@ function read_tag(tags::Dict{Symbol, String}, t::Vector{UInt8})
  end
 
  i = 9
+ # Find first null terminator
  while t[i] != 0
  i += 1
  end
  tags[tag_id] = String(t[9:(i-1)])
 
- # Skip null terminator/s, repeat in case multiple are present
- while t[i] == 0 && i < length(t) 
- i += 1
- end
- # Return remainder of t
- return t[i:end]
+ # Return remainder of t, skipping all data past first null terminator
+ return t[(9+size):end]
 end
 
 """