Sorter ignores // ignore: implementation_imports above imports when sorting

**Describe the bug**
I use // ignore: implementation_imports in my project above some imports because I use some packages and their implementation.

**To Reproduce**
What command or actions did you take to produce this error?
I added these comments and ran ```flutter pub run import_sorter:main```. Now these comments are listed below all the imports and not above the imports, which actually import implementation from packages.

**Expected behavior**
I expected that the comments are sorted with the imports.

Please let me know, if you need additional information. Thank you for your help.