Logging location suggestion

[axieax]

Hi, just realised that this plugin logs to the home directory as a non-hidden file. Do you think it'll be better if logs go to the standard cache directory, like plugins such as nvim itself, lsp, null-ls, telescope and a few others? This path is vim.fn.stdpath("cache") .. "/" .. "null-ls.log". If you're happy with this change, I can make a PR for it :))

[cmgriffing]

Yeah that is a great idea. Feel free to make the PR. Thanks.