Version 0.8.0
v0.8.0 New features:
1. Optimized the api for custom tokio runtime, better api definition, better experience.
Api changes.
1. Added: `tokio_runtime_by_default` & `tokio_runtime_by_custom` & `tokio_runtime_shared_by_custom` .
2. Private: `tokio_runtime`.
2. Optimized the method of canceling task instances, no error log is recorded when canceling a task failure after timeout.
3. Fix the compile error about `quit_one_task_handler` under nightly version.