mypy 0.590 breaks --python-version

gistfile1.txt

jreese@jreese-mbp ~/workspace/aiosqlite +master  » python3 --version
Python 3.6.4
jreese@jreese-mbp ~/workspace/aiosqlite +master  » mypy --version
mypy 0.580
jreese@jreese-mbp ~/workspace/aiosqlite +master  » mypy --ignore-missing-imports --python-version 3.5 aiosqlite
jreese@jreese-mbp ~/workspace/aiosqlite +master  » pip3 install mypy==0.590
Collecting mypy==0.590
  Downloading https://files.pythonhosted.org/packages/d6/e2/37a8a5dce634a094b90e13eda246a4b736a660124e78808f47fbad99f510/mypy-0.590-py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 913kB/s
Requirement already satisfied: typed-ast<1.2.0,>=1.1.0 in /Users/jreese/.pyenv/versions/3.6.4/lib/python3.6/site-packages (from mypy==0.590)
Installing collected packages: mypy
  Found existing installation: mypy 0.580
    Uninstalling mypy-0.580:
      Successfully uninstalled mypy-0.580
Successfully installed mypy-0.590
jreese@jreese-mbp ~/workspace/aiosqlite +master  » mypy --version
mypy 0.590
jreese@jreese-mbp ~/workspace/aiosqlite +master  » mypy --ignore-missing-imports --python-version 3.5 aiosqlite
usage: mypy [-h] [-v] [-V] [--python-version x.y]
            [--python-executable EXECUTABLE] [--no-site-packages]
            [--platform PLATFORM] [-2] [--ignore-missing-imports]
            [--follow-imports {normal,silent,skip,error}]
            [--disallow-any-unimported] [--disallow-any-expr]
            [--disallow-any-decorated] [--disallow-any-explicit]
            [--disallow-any-generics] [--disallow-untyped-calls]
            [--disallow-untyped-defs] [--disallow-incomplete-defs]
            [--check-untyped-defs] [--disallow-subclassing-any]
            [--warn-incomplete-stub] [--disallow-untyped-decorators]
            [--warn-redundant-casts] [--no-warn-no-return] [--warn-return-any]
            [--warn-unused-ignores] [--warn-unused-configs]
            [--show-error-context] [--no-implicit-optional] [--no-incremental]
            [--quick-and-dirty] [--cache-dir DIR] [--cache-fine-grained]
            [--skip-version-check] [--strict-optional]
            [--strict-optional-whitelist [GLOB [GLOB ...]]]
            [--always-true NAME] [--always-false NAME] [--junit-xml JUNIT_XML]
            [--pdb] [--show-traceback] [--stats] [--inferstats]
            [--custom-typing MODULE] [--custom-typeshed-dir DIR]
            [--scripts-are-modules] [--config-file CONFIG_FILE]
            [--show-column-numbers] [--find-occurrences CLASS.MEMBER]
            [--strict] [--shadow-file SOURCE_FILE SHADOW_FILE]
            [--any-exprs-report DIR] [--cobertura-xml-report DIR]
            [--html-report DIR] [--linecount-report DIR]
            [--linecoverage-report DIR] [--memory-xml-report DIR]
            [--txt-report DIR] [--xml-report DIR] [--xslt-html-report DIR]
            [--xslt-txt-report DIR] [-m MODULE] [-p PACKAGE] [-c PROGRAM_TEXT]
            [files [files ...]]
mypy: error: Error: failed to find a Python executable matching version (3, 5), perhaps try --python-executable, or --no-site-packages?