message: [skip travis] reword readme for new widget flag
diff: @@ -98,7 +98,7 @@ Run using `btm`.
  - `-R`, `--regex` will default to using regex.
  -- `--cpu_default`, `--memory_default`, `--disk_default`, `--temperature_default`, `--network_default`, `--process_default` will default the selected widget on startup to that option. By default the process widget is selected.
  +- `--cpu_default`, `--memory_default`, `--disk_default`, `--temperature_default`, `--network_default`, `--process_default` will select the corresponding widget on startup. By default the process widget is selected.
  - `-C`, `--config` takes in a file path leading to a TOML file.
  