Log Message:
py-peewee: updated to 3.9.6

3.9.6
Support nesting the Database instance as a context-manager. The outermost block \ 
will handle opening and closing the connection along with wrapping everything in \ 
a transaction. Nested blocks will use savepoints.
Add new session_start(), session_commit() and session_rollback() interfaces to \ 
the Database object to support using transactional controls in situations where \ 
a context-manager or decorator is awkward.
Fix error that would arise when attempting to do an empty bulk-insert.
Set isolation_level=None in SQLite connection constructor rather than afterwards \ 
using the setter.
Add create_table() method to Select query to implement CREATE TABLE AS.
Cleanup some declarations in the Sqlite C extension.
Add new example showing how to implement Reddit's ranking algorithm in SQL.