[GNU ELPA] Realgud version 1.5.1

[ELPA update]

Version 1.5.1 of package Realgud has just been released in GNU ELPA.
You can now find it in M-x list-packages RET.

Realgud describes itself as:

  ===========================================================
  A modular front-end for interacting with external debuggers
  ===========================================================

More at https://elpa.gnu.org/packages/realgud.html

## Summary:

  A modular, extensible GNU Emacs front-end for interacting with
  external debuggers.

  Quick start: https://github.com/realgud/realgud/

  See URL `https://github.com/realgud/realgud/wiki/Features' for features, and
  URL `https://github.com/realgud/realgud/wiki/Debuggers-Supported' for
  debuggers we can handle.

  Once upon a time in an Emacs far far away and a programming-style
  deservedly banished, there was a monolithic Cathederal-like
  debugger front-end called gud.  This interfaced with a number of
  debuggers, many now dead.[1]  Is there anyone still alive that
  remembers sdb from UNIX/32V circa 1980?

## Recent NEWS:

1.5.1 2019-07-15
================

* Remove "lexical-let"
* recursive-autoloads: Remove autoloads from packages that no longer are
  included, e.g. ipdb, jdb, nodejs
* Require 25.1 or greater pervasively; :version 24.3 -> 25.1 wherever
  that appears
* perldb.el: fix small cut-and-paste holdover
* NEWS -> NEWS.md
* Miscellaneous bugs fixed


1.5.0 2019-04-28
================

Emacs 25 or greater is now required.

ipdb, jdb, and nodejs (older node debug) removed from core. Get them as 
separate packages.

1.4.8 2019-04-25
================

Mostly lint-like fixes and a couple bug fixes to boot.


Emacs 25 or greater is now required.

ipdb, jdb, and nodejs (older node debug) removed from core. Get them as 
separate packages.

1.4.6 2019-04-04
================

Numerous changes and bug fixes. The main new feature though is adding a 
breakpoint buffer that is akin to the backtrace buffer.

1.4.5 2018-03-22
================

Stable version before a minor upheaval