0.9.0

• replace marshmallow serializers with pydantic
• add OpinionReading methods for getting anchored terms/passages
• add OpinionReading.anchored factors property
• add AnchoredHoldings.add_enactment method
• add AnchoredHoldings.insert_term method
• rename AnchoredHoldings.insert_term to add_term
• fix bug in "ignore" parameter to collect_mentioned data loading function
• fix bug: wrong function was used to expand text in enactment test data
• import CaseBody and CaseData models from Justopinion
• bump legislice dependency to 0.7.0
• bump anchorpoint dependency to 0.7.0
• remove marshmallow and marshmallow-oneofschema dependencies
• remove apispec and apispec-oneofschema dependencies
• remove enactment_index module
• remove downloads module
• remove schemas_yaml module
• remove EnactmentIndex class
• remove OpinionReading.implies_other_holdings method
• remove load_anchored_holdings function
• remove load_rules_with_index function
• remove collect_enactment_anchors function
• remove read_fact function
• remove TextLinkDict type annotation