Add support for STDLIB 5

[trekytech7]

At present puppetlabs-stdlib latest is 5.2.0. Please update to support newest version. :)
ie:
Warning: Module 'puppetlabs-stdlib' (v5.2.0) fails to meet some dependencies:
'counsyl-sys' (v0.9.23) requires 'puppetlabs-stdlib' (>= 4.7.0 <5.0.0)

Thx

[jdavisp3]

Pull requests welcome!