README still points to 0.4.0 binary download

[connerk]

the downloadable binary listed in the README does not include the new save feature

[mattpalermo]

Hi connerk, yes, I still haven't cut another release yet since I have not been using this addin (or Excel) since then and haven't had a chance to build and test the save feature. In my comment on PR #1 I asked if you could build, test and send me a binary but I no longer think that's a good idea. Perhaps you can fork this (or spence's copy) so you could implement some of your good ideas, modify it to your liking and share your take on it. Alternatively @spences10 might be more actively using and maintaining his copy and it might be worth trying to work on that copy (especially since it was the original copy and has more Github star attention).