Add libvorbisdec to deps (closes #162)

README.md

@@ -5,7 +5,7 @@ To-do list here: https://trello.com/b/F1YSa1VK
 
 # Dependencies
  * devkitPro, which can be installed following the instructions [here](https://devkitpro.org/wiki/Getting_Started).
- * zlib, jansson, and libarchive, which can be retrieved from [devkitPro pacman](https://devkitpro.org/viewtopic.php?f=13&t=8702).
+ * zlib, jansson, libvorbisidec, and libarchive, which can be retrieved from [devkitPro pacman](https://devkitpro.org/viewtopic.php?f=13&t=8702).
  * A recent build of [makerom](https://github.com/profi200/Project_CTR) and the latest release of [bannertool](https://github.com/Steveice10/bannertool). These must be added to your PATH.  
  A 64-bit Windows binary of makerom is available [here](https://hm892.s-ul.eu/U0Irkqih).
  * ~~[pp2d](https://github.com/BernardoGiordano/pp2d), which is included in the repo if you do a git clone --recursive.~~