Autocomplete doesn't work for words with starting characters outside a-z

Describe the bug The AutoComplete object does not find words that start with e.g. "æ, ø, å, ö"

To Reproduce

from fast_autocomplete import AutoComplete

def construct_autocomplete_dict(vocab: list, freq: list) -> dict:
    return {word: {"count": freq} for word, freq in zip(vocab, freq)}

ac_dict = construct_autocomplete_dict(['ål', 'øver', 'ære', 'ere', 'öra'], [1,2,3,4,5])
ac = AutoComplete(ac_dict)
print(ac.search('æ'))
print(ac.search('ö'))

Expected behavior Autocomplete finds the words "ære" and "öra". Instead it returns an empty list. Same for other words starting with letters like these.

OS, DeepDiff version and Python version (please complete the following information):

OS: macOS
Python Version: 3.7.11
I don't know what DeepDiff is

seperman / fast-autocomplete

Autocomplete doesn't work for words with starting characters outside a-z #33