Fix reference to undefined value typing.T

Author: c0llab0rat0r

Diff for: ipfshttpclient/utils.py

@@ -12,14 +12,16 @@
 else:
 	ty_ext = ty
 
+T = ty.TypeVar("T")
+
 if sys.version_info >= (3, 8):  #PY38+
 	Literal = ty_ext.Literal
 	Protocol = ty_ext.Protocol
 
 	Literal_True = ty.Literal[True]
 	Literal_False = ty.Literal[False]
 else:  #PY37-
-	class Literal(ty.Generic[ty.T]):
+	class Literal(ty.Generic[T]):
 		...
 
 	class Protocol:
@@ -240,4 +242,4 @@ def wrapper(*args: ty.Any, **kwargs: ty.Any) -> T:
 			"""
 			res = cmd(*args, **kwargs)  # type: ty.Dict[str, T]
 			return res[self.field]
-		return wrapper
+		return wrapper