more unicode proofing

kwant/version.py

@@ -86,7 +86,7 @@ def get_version_from_git():
 def init(version_file='_kwant_version.py'):
     global version, version_is_from_git
     version_info = {}
-    with open(os.path.join(package_root, version_file), 'r') as f:
+    with open(os.path.join(package_root, version_file), 'rb') as f:
         exec(f.read(), {}, version_info)
     version = version_info['version']
     version_is_from_git = (version == "__use_git__")

setup.py

@@ -364,7 +364,7 @@ def write_version(fname):
 def long_description():
     text = []
     try:
-        with open('README.rst') as f:
+        with open('README.rst', encoding='utf8') as f:
             for line in f:
                 if line.startswith('See also in this directory:'):
                     break