Add stubs for tabulate (#2384)

Author: gaul

third_party/2and3/tabulate.pyi

@@ -0,0 +1,18 @@
+# Stub for tabulate: https://bitbucket.org/astanin/python-tabulate
+from typing import Any, Dict, Iterable, Sequence, Union
+
+
+def __getattr__(name: str) -> Any: ...
+
+def tabulate(
+    tabular_data: Iterable[Iterable[Any]],
+    headers: Union[str, Dict[str, str], Sequence[str]] = ...,
+    tablefmt: str = ...,
+    floatfmt: str = ...,
+    numalign: str = ...,
+    stralign: str = ...,
+    missingval: str = ...,
+    showindex: str = ...,
+    disable_numparse: bool = ...
+) -> str:
+    ...