Cosmetic: First "perl Makefile.PL" complains about META.yml

[russellvt]

The first time you run "perl Makefile.PL" after cloning, the script complains about META.yml... and then proceeds to write it out. This is cosmetic in nature, though may "panic" the unwary.

$ perl Makefile.PL 
include /home/my_home_dir/github/monitoring-plugin-perl/inc/Module/Install.pm
include inc/Module/Install/Metadata.pm
include inc/Module/Install/Base.pm
include inc/Module/Install/Makefile.pm
include inc/Module/Install/WriteAll.pm
include inc/Module/Install/Win32.pm
include inc/Module/Install/Can.pm
include inc/Module/Install/Fetch.pm
Checking if your kit is complete...
Warning: the following files are missing in your kit:
	META.yml
Please inform the author.
Writing Makefile for Monitoring::Plugin
Writing MYMETA.yml and MYMETA.json
Writing META.yml