Things to tests(will updating): - Basic arguments usage - [x] Display help topic - [x] Display to console - [x] Write to file - [x] Write to file and display to console - Website checks(downloader) - [x] Little website(like 404 page) - [x] Static site - [x] Unreachable site - Converter checks - [x] `<HEAD></HEAD>` - [ ] Child elements - [x] Comments - [x] Several same-type elements - [x] Tag properties(boolean, multiple, with text) - [ ] One-liner tags - Integration - [x] Check integration with other file