Fix order of members when pickling Token

I found this while porting Token to C, essentially the value and pos_in_stream members of Token were swapped in ``__reduce__``, which means running ``pickle.loads`` and ``pickle.dumps`` would result in unpickled tokens whose value was the original's position in stream, and vice versa. In my C extension this caused a TypeError exception, but the behavior will have to be corrected in both.

lark/lexer.py

@@ -41,7 +41,7 @@ class Token(Str):
         return cls(type_, value, borrow_t.pos_in_stream, line=borrow_t.line, column=borrow_t.column)
 
     def __reduce__(self):
-        return (self.__class__, (self.type, self.pos_in_stream, self.value, self.line, self.column, ))
+        return (self.__class__, (self.type, self.value, self.pos_in_stream, self.line, self.column, ))
 
     def __repr__(self):
         return 'Token(%s, %r)' % (self.type, self.value)