Added stub for toaiff module (python#1455)

Author: ashwch

stdlib/2/toaiff.pyi

@@ -0,0 +1,16 @@
+# Stubs for toaiff (Python 2)
+
+# Source: https://hg.python.org/cpython/file/2.7/Lib/toaiff.py
+from pipes import Template
+from typing import Dict, List
+
+
+__all__: List[str]
+table: Dict[str, Template]
+t: Template
+uncompress: Template
+
+class error(Exception): ...
+
+def toaiff(filename: str) -> str: ...
+def _toaiff(filename: str, temps: List[str]) -> str: ...