Make formula abcde depend on cd-discid

Without it, the `abcde` does not function properly:

```
[ERROR] abcde: cd-discid is not in your path.
[INFO] Define the full path to the executable if it exists on your system.
```

Author: tiesjan

Formula/a/abcde.rb

@@ -32,6 +32,7 @@ class Abcde < Formula
 
   depends_on "pkgconf" => :build
 
+  depends_on "cd-discid"
   depends_on "cdrtools"
   depends_on "eye-d3"
   depends_on "flac"