Update the NEWS entry.

Author: serhiy-storchaka

Misc/NEWS.d/3.7.0b1.rst

@@ -630,6 +630,7 @@ Add contextlib.AsyncExitStack. Patch by Alexander Mohr and Ilya Kulakov.
 .. nonce: x5Sv0R
 .. section: Library
 
+*Removed in Python 3.7.0b2.*
 The *args* argument of subprocess.Popen can now be a :term:`path-like
 object`. If *args* is given as a sequence, it's first element can now be a
 :term:`path-like object` as well.