(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
 
 """