Add emoji to indicate LSP in supported-tools.md

As someone new to vim and lsp's it was a bit confusing to figure out what was a lsp, linter, or fixer from the supported-tools page. So I thought adding an emoji to represent the lsp's (say :zap:) would be a good way to help people that don't know. I have an updated md file that adds the :zap: emoji if the lsp is listed in Microsoft's lsp repo (https://microsoft.github.io/language-server-protocol/implementors/servers/). If that's wanted I can upload it? Otherwise loving ALE so far!