Added note of spell check feature in the Readme
 Additional for the Changelog

 It wasn't clear how one can migrate the css file, not that the file
 name changed
 support for pasting html into mikidown

 html is transofrmed back to markdown using html2text
 Fix for spell check when word is selected

 The selection is the is the only way I found to get the word under
 cursor, but with this fix it will not miss behave