fix: call execPostHooks on internalTransaction (#161)

Author: BasKiers

lib/model.js

@@ -319,7 +319,14 @@ class Model extends Entity {
             if (internalTransaction) {
                 // If we created the Transaction instance internally for the update, we commit it
                 // otherwise we leave the commit() call to the transaction creator
-                return transaction.commit().then(onTransactionSuccess);
+                return transaction
+                    .commit()
+                    .then(() => transaction.execPostHooks().catch((err) => {
+                        entityUpdated[
+                            entityUpdated.gstore.ERR_HOOKS
+                        ] = (entityUpdated[entityUpdated.gstore.ERR_HOOKS] || []).push(err);
+                    }))
+                    .then(onTransactionSuccess);
             }
 
             return onTransactionSuccess();