Till now, only the root command is looked for suggestions.
Now `findSuggestions` works for nested commands as well.
For example
```
Error: unknown command "rewin" for "root times"
Did you mean this?
rewind
Run 'root times --help' for usage.
```
Signed-off-by: Yuval Goldberg <yuvigoldi@gmail.com>
Fix some typos in README and comments.
Move arg validation to after flag validation so that the help flag is run first.
Pass the same args to ValidateArgs as the Run methods receive.
Update README.
Signed-off-by: Daniel Nephin <dnephin@gmail.com>