only layer3 (want 1; got 3) is supported!

[Heming9]

Steps to reproduce:

1. Open this file Sleep Away.mp3
2. Call mp3.Decode() on the file

Expected result:

Decoding file successfully

Actual result:

The function returns an error saying mp3: mp3: only layer3 (want 1; got 3) is supported

Notes:

I using a version of go-mp3 is v0.3.2 I use the mp3 file inside the same issue #9 that is decoded successfully