Rename LICENSE.md to LICENSE
There are several tools that look for the licenses and warn the users from licensing vulnerabilities (for example FOSSA). They expect that the license file will be called LICENSE or LICENSE.txt so in this repo they won't find it and will warn the user that the repo has no licensing. This PR goal is to rename the existing file and by that expose the license to those tools.
@vmarkovtsev, please review and approve
fwiw, https://github.com/go-enry/go-license-detector is both more precise and doesn't suffer from that arbitrary limitation on licenses in Markdown.
I suggest leaving LICENSE.md where it stands and creating a symlink to it from LICENSE. wdyt?