Add changelog

Author: rhooper

CHANGELOG.md

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+2024-02-12 v1.2.0
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+Synchronized LexMachinaClient to match current live API.
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+- Renamed `list_damages_statet` to `list_damages_state` (fix typo)
+- Removed `list_state_judgment_sources` 
+- Renamed `query_state_cases_case` to `query_state_cases`
+- Added `get_appeals_case` 
+- Added `query_appeals_case`
+- Added `list_state_judgment_events`
+- Added `list_originating_venues_federal`
+- Added `list_appellate_decisions_federal`
+- Added `list_supreme_court_decisions_federal`