- update to 19.3.0
* Fixed auto_attribs usage when default values cannot be compared directly
with ==, such as numpy arrays.

- update to version 19.2.0:
* Backward-incompatible Changes
+ Removed deprecated "Attribute" attribute "convert" per scheduled
removal on 2019/1. This planned deprecation is tracked in issue
`#307 `_.
`#504 `_
+ "__lt__", "__le__", "__gt__", and "__ge__" do not consider
subclasses comparable anymore. This has been deprecated since
18.2.0 and was raising a "DeprecationWarning" for over a year.
`#570 `_
* Deprecations
+ The "cmp" argument to "attr.s()" and "attr.ib()" is now
deprecated. Please use "eq" to add equality methods ("__eq__"
and "__ne__") and "order" to add ordering methods ("__lt__",
"__le__", "__gt__", and "__ge__") instead – just like with
`dataclasses
`_. Both
are effectively "True" by default but it's enough to set
"eq=False" to disable both at once. Passing "eq=False,
order=True" explicitly will raise a "ValueError" though. Since
this is arguably a deeper backward-compatibility break, it will
have an extended deprecation period until 2021-06-01. After
that day, the "cmp" argument will be removed. "attr.Attribute"
also isn't orderable anymore. `#574
`_
* Changes