rez-pip error when using python3.7

[bpabel]

System

• Windows 10
• rez 2.61.1
• python 3.7

Error

$ rez-pip -i -r --python-version 2.7 ampq
... [trim some site information]
Collecting amqp
  Downloading amqp-2.6.0-py2.py3-none-any.whl (47 kB)
     |UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU| 47 kB 280 kB/s
Collecting vine<5.0.0a1,>=1.1.3
  Downloading vine-1.3.0-py2.py3-none-any.whl (14 kB)
Installing collected packages: vine, amqp
Successfully installed amqp-2.6.0 vine-1.3.0
WARNING: You are using pip version 20.1; however, version 20.1.1 is available.
You should consider upgrading via the 'c:\python27\python.exe -m pip install --upgrade pip' command.
21:57:18 INFO     Installed [amqp-2.6.0] i:\tools\rez\packages\release\amqp\2.6.0\package.py (ff5a17a870e473adea6d65972631222d54a381e6)
Traceback (most recent call last):
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\serialise.py", line 72, in open_file_for_write
    f.write(content)
  File "C:\Program Files\rez\2.61.1\Python\Lib\contextlib.py", line 119, in __exit__
    next(self.gen)
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\vendor\atomicwrites\__init__.py", line 154, in _open
    self.commit(f)
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\vendor\atomicwrites\__init__.py", line 185, in commit
    replace_atomic(f.name, self._path)
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\vendor\atomicwrites\__init__.py", line 92, in replace_atomic
    return _replace_atomic(src, dst)
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\vendor\atomicwrites\__init__.py", line 75, in _replace_atomic
    _windows_default_flags | _MOVEFILE_REPLACE_EXISTING
  File "c:\progra~1\rez\261~1.1\lib\site-packages\rez\vendor\atomicwrites\__init__.py", line 70, in _handle_errors
    raise WinError()
OSError: [WinError 17] The system cannot move the file to a different disk drive.

Description

Looks like serialise.py is set up to catch a WindowsError, but the vendored atomicwrites raises an OSError in python 3.7

WindowsError merged into OSError in python 3.3