[beast: 2/11] HACKING.md: mention deduplicaiton of old enum names

[Tim Janik <timj src gnome org>]

commit 8ee05b8a080ef92955b10418c72d909a41964563
Author: Tim Janik <timj gnu org>
Date:   Mon Sep 4 00:20:16 2017 +0200

    HACKING.md: mention deduplicaiton of old enum names
    
    Signed-off-by: Tim Janik <timj gnu org>

 HACKING.md |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/HACKING.md b/HACKING.md
index 299a697..56fd9b1 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -43,9 +43,10 @@ Bstrecords-Migration
 --------------------
 **[COMPLETED]** Beast used to generate some structures from bstrecords.idl (sfidl), these are all migrated 
into bstapi.idl (ADIA IDL).
 
-Enum-Migration
---------------
+Enum-Migrations
+---------------
 **[COMPLETE]** Beast enums have all been migrated from scanned C headers into bstapi.idl.
+**[UNFINISHED]** Enums still present for historic reasons need to be deduplicated, one example: 
`BSE_MIDI_PITCH_BEND` vs `Bse::MidiSignal::PITCH_BEND`.
 
 C++11-Compilation
 -----------------