python3-attrs: Upgrade 19.3.0 -> 20.1.0

Upgrade to release 20.1.0:

- Python 3.4 is not supported anymore.
- Added attr.resolve_types(). It ensures that all
  forward-references and types in string form are resolved
  into concrete types.
- Added @attr.s(collect_by_mro=False) argument that if set to
  True fixes the collection of attributes from base classes.
- On Python 3, all generated methods now have a docstring
  explaining that they have been created by attrs.
- Fixed a ValueError: Cell is empty bug that could happen in some
  rare edge cases.
- Added attr.converters.pipe(). The feature allows combining
  multiple conversion callbacks into one by piping the value
  through all of them, and retuning the last result.
- Provisionally added attr.field() that supplants attr.ib().

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-attrs_20.1.0.bb

@@ -3,8 +3,8 @@ HOMEPAGE = "http://www.attrs.org/"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=d4ab25949a73fe7d4fdee93bcbdbf8ff"
 
-SRC_URI[sha256sum] = "f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
-SRC_URI[md5sum] = "5b2db50fcc31be34d32798183c9bd062"
+SRC_URI[sha256sum] = "0ef97238856430dcf9228e07f316aefc17e8939fc8507e18c6501b761ef1a42a"
+SRC_URI[md5sum] = "ab7533fc91c5db3d5b65e66be907444e"
 
 inherit pypi setuptools3