0.8.0

• Prints usage message when user gives bad arguments to commands.
• Auto-updates disabled at autocompletion code.
• Some refactoring done at the commands.
• Command categories implemented. (default commands, admin commands, etc.)
• Auto-updates disabled if the tmc-cli is installed through package manager.
• Prints error messages into standard error.
• New --uninstall option. (It's not shown currently in the --help)