Move docstring to class

pysnooper/tracer.py

@@ -132,16 +132,6 @@ thread_global = threading.local()
 
 
 class Tracer:
-    def __init__(
-            self,
-            output=None,
-            watch=(),
-            watch_explode=(),
-            depth=1,
-            prefix='',
-            overwrite=False,
-            thread_info=False,
-    ):
     '''
     Snoop on the function, writing everything it's doing to stderr.
 
@@ -179,6 +169,16 @@ class Tracer:
 
         @pysnooper.snoop(thread_info=True)
     '''
+    def __init__(
+            self,
+            output=None,
+            watch=(),
+            watch_explode=(),
+            depth=1,
+            prefix='',
+            overwrite=False,
+            thread_info=False,
+    ):
         self._write, self.truncate = get_write_and_truncate_functions(output)
 
         if self.truncate is None and overwrite: