setup.py: fix parsing debian changelog with nonascii chars

setup.py

@@ -21,6 +21,7 @@
 import os
 import glob
 import sys
+import codecs
 
 from setuptools import setup, Command
 
@@ -49,7 +50,7 @@ def finalize_options(self):
     def run(self):
         version = get_version()
         try:
-            with open("debian/changelog") as f:
+            with codecs.open("debian/changelog", encoding='utf8', errors='ignore') as f:
                 firstline = f.readline()
                 if version not in firstline:
                     # returning false is not promoted