No version for one to many relationships.#346

I'm using sqlalchemy-continuum version 1.4.0 for testing the versioning capabilities. Defined following classes according to documentation - ``` make_versioned(user_cls=None) class Article(Base): __versioned__ = {} __tablename__ = 'article' id = sa.Column(sa.Integer, primary_key=True, autoincrement=True) name = sa.Column(sa.Unicode(255)) content = sa.Column(sa.UnicodeText) class Tag(Base): __tablename__ = 'tag' __versioned__ = {} id = sa.Column(sa.Integer, autoincrement=True, primary_key=True) name = sa.Column(sa.Unicode(255)) article_id = sa.Column(sa.Integer, sa.ForeignKey(Article.id)) article = sa.orm.relationship( Article, backref=sa.orm.backref( 'article_tags', lazy='dynamic' ) ) sa.orm.configure_mappers() # Initialized the entities like this - article = Article( name=u'Some article 2' ) tag1 = Tag(name="A2T1", article=article) tag2 = Tag(name="A2T2", article=article) db.session.add(article) db.session.add_all([tag1, tag2]) db.session.commit() tag3 = Tag(name="A2T3", article=article) db.session.add(tag3) db.session.commit() # Accessed the entity like this - article_id = int(request.args.get('id')) sample_article = db.session.query(Article).filter(Article.id == article_id).first() first_version = sample_article.versions[0] second_version = first_version.next ``` The second_version is always None. It is not loading the next version. I've tried updating this entity multiple times yet the result remains the same. What could be wrong here ?