latest astroid dependencies break mypy

[astir13]

with python 3.6.7 and Pipenv:
having astroid and mypy in your Pipfile
you'll get a

Error:
pipenv.exceptions.ResolutionFailure

in case you try to lock Pipenv using command

pipenv -v lock

Some details in regards to why that

Error:
pipenv.exceptions.ResolutionFailure

happens can be found by the command pipenv -v lock a bit longer up in the output:

astroid==2.2.0 requires lazy-object-proxy, six, typed-ast<1.3.0
mypy==0.670 requires mypy-extensions<0.5.0,>=0.4.0, typed-ast<1.4.0,>=1.3.1

obviously, this cannot be resolved.

I propose that astroid team tries to change the dependency to allow for newer typed-ast soon.

As a temporary solution, you can lock mypy to 0.660 in your Pipfile using:

mypy = "==0.660"

[Larz60+]

python-forum.io does not maintain astroid.
this suggestion should be directed to authors, github site: https://github.com/PyCQA/astroid

[astir13]

wilco asap. thanks!