<commit_before># Environment

* Output of `tsrc version`: ...
* Output of `python --version`: ...
* Operating system: ...

# Command you ran

```console
$ ...
```

# Actual output

```text
...
```

# Expected result
<commit_msg>ISSUE_TEMPLATE: replace h1 by h3<commit_after>### Environment

* Output of `tsrc version`: ...
* Output of `python --version`: ...
* Operating system: ...

### Command you ran

```console
$ ...
```

### Actual output

```text
...
```

### Expected result

{'fraction_non_alphanumeric': 0.21325051759834368, 'fraction_numerical': 0.004140786749482402, 'mean_word_length': 3.0, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '460841', 'n_tokens_mistral': 174, 'n_tokens_neox': 158, 'n_words': 46}