Merge pull request #889 from Vlad-Shcherbina/subprocess_cwd

Add `cwd` argument to Python 3 stubs for subprocess calls.

Author: JukkaL

stubs/3.2/subprocess.pyi

@@ -12,11 +12,13 @@ def call(args: Sequence[str], *, stdin: Any = None, stdout: Any = None,
          cwd: str = None) -> int: ...
 def check_call(args: Sequence[str], *, stdin: Any = None, stdout: Any = None,
                stderr: Any = None, shell: bool = False,
-               env: Mapping[str, str] = None) -> int: ...
+               env: Mapping[str, str] = None,
+               cwd: str = None) -> int: ...
 # Return str/bytes
 def check_output(args: Sequence[str], *, stdin: Any = None, stderr: Any = None,
                  shell: bool = False, universal_newlines: bool = False,
-                 env: Mapping[str, str] = None) -> Any: ...
+                 env: Mapping[str, str] = None,
+                 cwd: str = None) -> Any: ...
 
 # TODO types
 PIPE = ... # type: Any