Log Message:
textproc/csvlens: update to 0.4.0

This release adds support for the following:
 - Show help page with key bindings (H)
 - Scroll to left most and right most columns (Ctrl + ← or Ctrl + →)
 - Scroll forward and backward half a window (Ctrl + d or Ctrl + u)
 - Resize columns (< or >)
 - Reset to default view (r)