Update UltiSnips markdown.snippets
Update UltiSnips markdown.snippets

Make `HTTPS` the default protocol.
Update `http://` to `https://`.
adam-e-trepanier/vim-snippets,honza/vim-snippets,phatograph/vim-snippets,craigp/vim-snippets,craigp/vim-snippets,needle-wang/vim-snippets,kevinkirkup/vim-snippets,honza/vim-snippets,needle-wang/vim-snippets,adam-e-trepanier/vim-snippets,phatograph/vim-snippets,kevinkirkup/vim-snippets