[Bug] Incorrect results with some numbers

## Steps
```py
from redditscore.tokenizer import CrazyTokenizer

tokenizer = CrazyTokenizer(hashtags='split')
tokenizer.tokenize("#20yearsago")
```
## Actual Result
```py
['2', '0', 'y', 'e', 'a', 'r', 's', 'a', 'g', 'o']
```
## Expected Result
```py
['20', 'years', 'ago']
```