correct utcoffset return type (#554)

Author: samuelcolvin

stdlib/2.7/datetime.pyi

@@ -94,7 +94,7 @@ class time:
     def isoformat(self) -> str: ...
     def strftime(self, fmt: str) -> str: ...
     def __format__(self, fmt: str) -> str: ...
-    def utcoffset(self) -> Optional[int]: ...
+    def utcoffset(self) -> Optional[timedelta]: ...
     def tzname(self) -> Optional[str]: ...
     def dst(self) -> Optional[int]: ...
     def replace(self, hour: int = ..., minute: int = ..., second: int = ...,
@@ -203,7 +203,7 @@ class datetime(object):
     def isoformat(self, sep: str = ...) -> str: ...
     @classmethod
     def strptime(cls, date_string: str, format: str) -> datetime: ...
-    def utcoffset(self) -> Optional[int]: ...
+    def utcoffset(self) -> Optional[timedelta]: ...
     def tzname(self) -> Optional[str]: ...
     def dst(self) -> Optional[int]: ...
     def __le__(self, other: datetime) -> bool: ...

stdlib/3/datetime.pyi

@@ -93,7 +93,7 @@ class time:
     def isoformat(self) -> str: ...
     def strftime(self, fmt: str) -> str: ...
     def __format__(self, fmt: str) -> str: ...
-    def utcoffset(self) -> Optional[int]: ...
+    def utcoffset(self) -> Optional[timedelta]: ...
     def tzname(self) -> Optional[str]: ...
     def dst(self) -> Optional[int]: ...
     def replace(self, hour: int = ..., minute: int = ..., second: int = ...,
@@ -203,7 +203,7 @@ class datetime:
     def isoformat(self, sep: str = ...) -> str: ...
     @classmethod
     def strptime(cls, date_string: str, format: str) -> datetime: ...
-    def utcoffset(self) -> Optional[int]: ...
+    def utcoffset(self) -> Optional[timedelta]: ...
     def tzname(self) -> Optional[str]: ...
     def dst(self) -> Optional[int]: ...
     def __le__(self, other: datetime) -> bool: ...