check_whitespace/arrow_alignment doesn't handle all cases properly

[gerases]

Describe the Bug

Given code similar to below:

someresource { 'title':
  foo          => 'bar',
}

No warnings are raised

Expected Behavior

I would expect the extra white space to be flagged, but I realize this might have been outside the scope of this plugin. If this is the case, can you recommend the plugin needed?

[gerases]

Upon further contemplation, I realized that it's probably outside the scope of this arrow_alignment plugin. So I wrote a separate plugin to handle this case. I will submit a PR within the coming days.

[kenyon]

The separate PR was #175.