Fix bug in MC_slot_update2 parsem

Somewhere along the way I forgot to add the item IDs
for Bow and Flint & Steel. As a result, parsing of
message 0x0f was failing for e.g. drawing back the
bow.

mc3p/parsing.py

@@ -225,6 +225,8 @@ def emit_slot_update(update):
 MC_slot_update = Parsem(parse_slot_update, emit_slot_update)
 
 SLOT_UPDATE_2_ITEM_IDS = set([
+    0x103, #Flint and steel
+    0x105, #Bow
     0x15A, #Fishing rod
     0x167, #Shears