update readme contributors section - pull request requirements
update readme contributors section - pull request requirements

SimonWaldherr/uploader,FineUploader/fine-uploader,FineUploader/fine-uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,FineUploader/fine-uploader