docs: add missing __aenter__/__aexit__ docstrings

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "redis_store"
-version = "0.2.0"
+version = "0.2.1"
 description = "async redis wrapper over redis-py asyncio with a raw escape hatch, fail-loud and config-free"
 requires-python = ">=3.10"
 dependencies = [