Latest master doesn't work installing using pip #4569

Traceback (most recent call last):
  File "/Users/david/src/zapgram/.ve/bin/mypy", line 11, in <module>
    load_entry_point('mypy===0.570-dev-bdd5de949f4ee8f9333cabd0ac7282acc2aefaa4', 'console_scripts', 'mypy')()
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/pkg_resources/__init__.py", line 572, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2755, in load_entry_point
    return ep.load()
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2408, in load
    return self.resolve()
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2414, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/__main__.py", line 3, in <module>
    from mypy.main import main
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/main.py", line 13, in <module>
    from mypy import build
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/build.py", line 37, in <module>
    from mypy.semanal_pass1 import SemanticAnalyzerPass1
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/semanal_pass1.py", line 30, in <module>
    from mypy.semanal import SemanticAnalyzerPass2, infer_reachability_of_if_statement
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/semanal.py", line 75, in <module>
    from mypy.typeanal import (
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/typeanal.py", line 29, in <module>
    from mypy.plugin import Plugin, TypeAnalyzerPluginInterface, AnalyzeTypeContext
  File "/Users/david/src/zapgram/.ve/lib/python3.6/site-packages/mypy/plugin.py", line 7, in <module>
    import mypy.plugins.attrs
ModuleNotFoundError: No module named 'mypy.plugins'