Fix reading files with utf8 encoding

Author: RyeMutt

git_hooks/copyright.py

@@ -12,7 +12,7 @@ def main(argv=None):
 
     missing_copyright = False
     for filename in args.filenames:
-        with open(filename) as f:
+        with open(file=filename, encoding='utf-8') as f:
             if "Copyright" not in f.read():
                 eprint("{}: No copyright notice".format(filename))
                 missing_copyright = True

git_hooks/indent_with_tabs.py

@@ -14,7 +14,7 @@ def main(argv=None):
     found_spaces = False
     for filename in args.filenames:
         count = 0
-        with open(filename) as f:
+        with open(file=filename, encoding='utf-8') as f:
             for line in f.readlines():
                 if line.startswith(" "):
                     count += 1

git_hooks/no_trigraphs.py

@@ -14,7 +14,7 @@ def main(argv=None):
 
     trigraphs_present = False
     for filename in args.filenames:
-        with open(filename) as f:
+        with open(file=filename, encoding='utf-8') as f:
             found_trigraphs = re.findall(r"\?\?[=/')!<>-]", f.read())
 
             if not found_trigraphs: