gnuplot: Update version from 5.0.0 to 5.0.5

Release notes [1]:

> Gnuplot version 5.0 was initially released in January 2015. Please see
> the NEWS and ChangeLog files for a complete list of bug fixes and
> minor changes accummulated since then.
>
> These release notes are for version 5.0 patchlevel 5 (5.0.5). This
> release contains bug-fixes, a few changes back-ported from the
> development version, and a few new features.
>
> Release Notes date: 10-Oct-2016

[1] http://gnuplot.info/ReleaseNotes_5_0_5.html

gnuplot.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION gnuplot-5.0.0-0
+# BEE_VERSION gnuplot-5.0.5-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)