TINY-1769: updated changelog for 4.8.0 release
TINY-1769: updated changelog for 4.8.0 release

tinymce/tinymce,FernCreek/tinymce,danielpunkass/tinymce,danielpunkass/tinymce,TeamupCom/tinymce,danielpunkass/tinymce,FernCreek/tinymce,tinymce/tinymce,tinymce/tinymce,TeamupCom/tinymce,FernCreek/tinymce