add stubs for zipapp (#1046)

* add zipapp
* add BinaryIO to _Path

stdlib/3.5/zipapp.pyi

@@ -0,0 +1,11 @@
+# Stubs for zipapp (Python 3.5+)
+
+from pathlib import Path
+from typing import BinaryIO, Optional, Union
+
+_Path = Union[str, Path, BinaryIO]
+
+class ZipAppError(Exception): ...
+
+def create_archive(source: _Path, target: Optional[_Path] = ..., interpreter: Optional[str] = ..., main: Optional[str] = ...) -> None: ...
+def get_interpreter(archive: _Path) -> str: ...