Update README.md

Changed out links to the annotation style per hakan's request in IRC.
Update README.md

Attemped to add the shield icon, does not look correct in preview, checking to see if it looks correct committed.
Update README.md

I can't get a SVG hosted on GitHub to work, removing the line I added.
Merge pull request #705 from leftler/patch-1

Updated Readme.md to use annotated linking style per hakan's request.