[NonGNU ELPA] Geiser version 0.28.1

[ELPA update]

Version 0.28.1 of package Geiser has just been released in NonGNU ELPA.
You can now find it in M-x list-packages RET.

Geiser describes itself as:

  =======================================
  GNU Emacs and Scheme talk to each other
  =======================================

More at https://elpa.nongnu.org/nongnu/geiser.html

## Summary:

  Table of Contents
  ─────────────────

  1. Overview
  2. Supported schemes
  3. Installation
  ..... 1. Using ELPA
  ..... 2. From a repository checkout
  4. Basic configuration
  .. 1. Completion at point
  .. 2. Macro expansion with macrostep-geiser
  5. Quick key reference
  .. 1. In Scheme buffers:
  .. 2. In the REPL
  .. 3. In the documentation browser:
  .. 4. In backtrace (evaluation/compile result) buffers:
  6. How to support a new scheme implementation


  1 Overview
  ══════════

    Geiser is a generic Emacs/Scheme interaction mode, featuring an
    enhanced REPL and a set of minor modes improving Emacs' basic scheme
    major mode. The main functionalities provided are:

## Recent NEWS:

[Not available 🙁]