You don’t have to write all the spaces to make the table look nice. Even with the Github Extension this is optional. You can do tables like this:
| Header | Another Header |
|---------|----------------|
| field 1 | value one |
Or like this:
| Header | Another Header |
|-|-|
| field 1 | value one |
Sure the first one is nicer, but it shouldn’t matter if you align the whitespaces.