[monitoring-plugin-perl] Added missing ABSTRACT as reported by CPANTS.

[Mohammad S Anwar]

 Module: monitoring-plugin-perl
 Branch: master
 Commit: 75f446bb06f552885fe38c5776d609c5f6c0663e
 Author: Mohammad S Anwar <mohammad.anwar at yahoo.com>
   Date: Thu Oct 10 12:36:22 2019 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugin-perl/commit/?id=75f446b

Added missing ABSTRACT as reported by CPANTS.

---

 Makefile.PL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.PL b/Makefile.PL
index 2fa285d..2d6379d 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -1,7 +1,7 @@
 use inc::Module::Install;
 
 name        'Monitoring-Plugin';
-all_from    'lib/Monitoring/Plugin/Functions.pm';
+all_from    'lib/Monitoring/Plugin.pm';
 author      'Monitoring Plugin Team <devel at monitoring-plugins.org>';
 license     'perl';
 repository  'https://github.com/monitoring-plugins/monitoring-plugin-perl';