[NonGNU ELPA] Symbol-Overlay version 4.2

[ELPA update]

Version 4.2 of package Symbol-Overlay has just been released in NonGNU ELPA.
You can now find it in M-x list-packages RET.

Symbol-Overlay describes itself as:

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  Highlight symbols with keymap-enabled overlays
  ==============================================

More at https://elpa.nongnu.org/nongnu/symbol-overlay.html

## Summary:

  Highlighting symbols with overlays while providing a keymap for various
  operations about highlighted symbols.  It was originally inspired by the
  package `highlight-symbol'.  The fundamental difference is that in
  `symbol-overlay' every symbol is highlighted by the Emacs built-in function
  `overlay-put' rather than the `font-lock' mechanism used in
  `highlight-symbol'.

  Advantages

## Recent NEWS:

[Not provided 🙁]