1.9.1

• reduced required PHP version to 7.1 - using proc_open for subprocess operation no longer necessary, so keeping up with symfony/process package not needed.
• reorder to have PHP native events to run first, before libuv events, the other way was causing timing and various issues.
• added file_delete to recursively delete in thread/subprocess.
• added methods/routines and examples to have libuv handle file changes monitoring on the file system.
• use libuv uv_timer feature as default for sleep_for and wait_for task execution timing control, add test for native check.
• update readme to a new paradigm, and docblock corrections/updates.
• have Coroutine setup method control libuv overall and other class state.
• added method to retrieve the Task object instance from task id.
• bug fixes, the channel ipc progress feature wasn't working correctly when other tasks running, some workaround fixes for now.
• update test/example to match required BC version.
• rework how gather handle subprocess tasks.
• improve coroutine execute method when being re-entering from gather.