Commits excluded by scope still generate a subtitle entry

[nsenave]

If all commits of a certain type get filtered by excludeScopes, a sub-title for the corresponding type is still added in the changelog.

Example:

      excludeScopes: 'bar'

fix(foo): some fix
refactor(bar): some refactor

The result is like:

### :bug: Bug Fixes
- [`commit sha`](commit link) - **foo**: some fix

### :recycle: Refactors