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Convert Date Format

Write a Python function `change_date_format` that takes a string representing a date in the format `yyyy-mm-dd` and converts it to the format `dd-mm-yyyy`.

#### Example Usage
```python [main.nopy]
print(change_date_format("2026-01-02"))  # Output: "02-01-2026"
print(change_date_format("2020-11-13"))  # Output: "13-11-2020"
print(change_date_format("2021-04-26"))  # Output: "26-04-2021"
```

#### Constraints
- The input string will always be in the format `yyyy-mm-dd`.
- The function should return the reformatted date as a string.
def change_date_format(dt):
    """
    Convert a date from yyyy-mm-dd format to dd-mm-yyyy format.

    Args:
        dt (str): A date string in the format yyyy-mm-dd.

    Returns:
        str: The date string in the format dd-mm-yyyy.
    """
    # Write your code here
    pass
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