Problem: serializing to TOML

[yrashk]

When attempting to serialize Definitions to TOML, it fails with TableAfterValue:

thread 'serialize_deserialize_serde_toml' panicked at 'called `Result::unwrap()` on an `Err` value: ValueAfterTable', tests/bpmn_test.rs:41:46

However, JSON, RON, MessagePack and YAML work.