add (overwrite with) mypy stubs, if available

stdlib/2.7/gzip.pyi

@@ -0,0 +1,41 @@
+# Stubs for gzip (Python 2)
+#
+# NOTE: Based on a dynamically typed stub automatically generated by stubgen.
+
+from typing import Any, IO
+import io
+
+class GzipFile(io.BufferedIOBase):
+    myfileobj = ... # type: Any
+    max_read_chunk = ... # type: Any
+    mode = ... # type: Any
+    extrabuf = ... # type: Any
+    extrasize = ... # type: Any
+    extrastart = ... # type: Any
+    name = ... # type: Any
+    min_readsize = ... # type: Any
+    compress = ... # type: Any
+    fileobj = ... # type: Any
+    offset = ... # type: Any
+    mtime = ... # type: Any
+    def __init__(self, filename: str = None, mode: str = None, compresslevel: int = 9,
+                 fileobj: IO[str] = None, mtime: float = None) -> None: ...
+    @property
+    def filename(self): ...
+    size = ... # type: Any
+    crc = ... # type: Any
+    def write(self, data): ...
+    def read(self, size=-1): ...
+    @property
+    def closed(self): ...
+    def close(self): ...
+    def flush(self, zlib_mode=...): ...
+    def fileno(self): ...
+    def rewind(self): ...
+    def readable(self): ...
+    def writable(self): ...
+    def seekable(self): ...
+    def seek(self, offset, whence=0): ...
+    def readline(self, size=-1): ...
+
+def open(filename: str, mode: str = '', compresslevel: int = ...) -> GzipFile: ...