move typing imports to top of file

fatamorgana/basic.py

@@ -2,8 +2,8 @@
 This module contains all datatypes and parsing/writing functions for
  all abstractions below the 'record' or 'block' level.
 """
-from fractions import Fraction
 from typing import List, Tuple, Type, Union, Optional, Any, Sequence
+from fractions import Fraction
 from enum import Enum
 import math
 import struct

fatamorgana/records.py

@@ -10,8 +10,8 @@ Higher-level code (e.g. monitoring for combinations of records with
  parse, or code for dealing with nested records in a CBlock) should live
  in main.py instead.
 """
-from abc import ABCMeta, abstractmethod
 from typing import List, Dict, Tuple, Union, Optional, Sequence, Any, TypeVar
+from abc import ABCMeta, abstractmethod
 import copy
 import math
 import zlib