fix event dispatch for IE11
fix event dispatch for IE11

sferoze/quilljs,sferoze/quilljs,quilljs/quill,willrowe/quill,quilljs/quill,tim-mc/quill,fraywing/quill,willrowe/quill,quilljs/quill,voxmedia/quill,voxmedia/quill,willrowe/quill,tim-mc/quill,sferoze/quilljs,fraywing/quill,sferoze/quilljs,voxmedia/quill