Please solve the programming task below using a self-contained code snippet in a markdown code block.

An integer has sequential digits if and only if each digit in the number is one more than the previous digit.
Return a sorted list of all the integers in the range [low, high] inclusive that have sequential digits.
 
Please complete the following python code precisely:
```python
class Solution:
    def sequentialDigits(self, low: int, high: int) -> List[int]:
```