Store non_name_characters in a list, not a str

Fixes a «'ascii' codec can't decode» error on filter_characters

Author: Ángel González

pythonwhois/parse.py

@@ -494,7 +494,7 @@ def allow_trailing_comma_dict(regexes):
 known_abbreviations = precompile_regexes_dict(known_abbreviations, re.IGNORECASE)
 
 duplicate_spaces = re.compile(" {2,}")
-non_name_characters = ''.join(char for char in map(chr, range(256)) if not char.isalpha())
+non_name_characters = [char for char in map(chr, range(256)) if not char.isalpha()]
 name_separators = re.compile(r'[, ]+')
 comma_without_space = re.compile(r',([a-z])', re.IGNORECASE)