Release v0.9.4

• no changes

v0.9

add strict mode: cfg4py will check cfg4py_server_role only if it's in strict mode.By default it's non strict mode

Add environment macro

This release add environment macro. Now you can define config like this:

# defaults.yaml
postgres:
    dsn: postgres://${account}:${password}@localhost/

After cfg4py.init(), the account and password will be replaced by its value defined in environment variables.