Merge pull request #53 from Nexus-Mods/collections-end-inclusive

Fix a bug with collections attributes being end inclusive

src/NexusMods.MnemonicDB.Abstractions/Attributes/CollectionAttribute.cs

@@ -25,7 +25,7 @@ public Values<TValue, TLowLevel> Get(IEntity ent)
             if (datom.A != dbId) continue;
 
             var start = i;
-            while (i < segment.Count && segment[i].A == dbId)
+            while (i < segment.Count - 1 && segment[i].A == dbId)
             {
                 i++;
             }