handle deprecation warning in python 3.8

python/damask/asciitable.py

@@ -2,7 +2,7 @@ import os
 import sys
 import re
 import shlex
-from collections import Iterable
+from collections.abc import Iterable
 
 import numpy as np
 

python/damask/test/test.py

@@ -1,10 +1,8 @@
-# -*- coding: UTF-8 no BOM -*-
-
 import os,sys,shutil
 import logging,logging.config
 import damask
 import numpy as np
-from collections import Iterable
+from collections.abc import Iterable
 from optparse import OptionParser
 
 class Test():