Mark files that were copied with modifications from CPython.

Author: 1st1

tests/test_futures.py

@@ -1,3 +1,5 @@
+# LICENSE: PSF.
+
 import asyncio
 import concurrent.futures
 import re

tests/test_tasks.py

@@ -1,3 +1,5 @@
+# LICENSE: PSF.
+
 import asyncio
 
 from asyncio import test_utils

uvloop/chain_futs.pyx

@@ -1,3 +1,5 @@
+# LICENSE: PSF.
+
 # Copied from asyncio 3.5.2.  Remove this file when we don't need
 # to support earlier versions.
 

uvloop/future.pyx

@@ -1,3 +1,5 @@
+# LICENSE: PSF.
+
 DEF _FUT_PENDING = 1
 DEF _FUT_CANCELLED = 2
 DEF _FUT_FINISHED = 3

uvloop/task.pyx

@@ -1,3 +1,5 @@
+# LICENSE: PSF.
+
 cdef class BaseTask(BaseFuture):
     cdef:
         readonly object _coro