Update thread.py

Author: GoodManWEN

ThreadPoolExecutorPlus/thread.py

@@ -212,8 +212,10 @@ def __init__(self, max_workers=None, thread_name_prefix='',
             # Use this number because ThreadPoolExecutor is often
             # used to overlap I/O instead of CPU work.
             max_workers = DEFAULT_MAXIMUM_WORKER_NUM
-        if max_workers <= self._min_workers:
-            raise ValueError(f"max_workers must be greater than min_workers = {self._min_workers}")
+        if max_workers < 1:
+            raise ValueError(f"max_workers must be greater than min_workers , min_workers must be greater than 1")
+        elif 1 <= max_workers < self._min_workers:
+            self._min_workers = max_workers
 
         if initializer is not None and not callable(initializer):
             raise TypeError("initializer must be a callable")
@@ -320,4 +322,4 @@ def shutdown(self, wait=True):
         if wait:
             for t in self._threads:
                 t.join()
-    shutdown.__doc__ = _base.Executor.shutdown.__doc__
+    shutdown.__doc__ = _base.Executor.shutdown.__doc__