fix appveyor build script

we now have a module named "types",
which of course confuses Python 3.5. O:-)

.appveyor.yml

@@ -34,7 +34,7 @@ install:
 test_script:
   - ps: "tox -- --verbose --cov-report=term"
   - ps: |
-      $Env:VERSION = $(python mitmproxy/version.py)
+      $Env:VERSION = $(python -m mitmproxy.version)
       $Env:SKIP_MITMPROXY = "python -c `"print('skip mitmproxy')`""
       tox -e rtool -- wheel
       tox -e rtool -- bdist

mitmproxy/__init__.py

@@ -1,3 +0,0 @@
-# https://github.com/mitmproxy/mitmproxy/issues/1809
-# import script here so that pyinstaller registers it.
-from . import script  # noqa

release/hooks/hook-mitmproxy.py

@@ -0,0 +1 @@
+hiddenimports = ["mitmproxy.script"]