version 0.5.0

Add support for DNS zones management (#50)

* stacks: add DNS zone basic handling (create/delete/update label/index)

* DNS zones: add routines to handle DNS records managing

no waf metrics

waf analytics

New capability of StackPath API of updating policy groups at once

method name changed due to naming collision with site attribute "moni…

…toring" (#45)

removed dict loading because api returns a list (#44)

added monitoring toggle, api url update, api login url update (#43)

typo fixed on policy retrieval

enhancement: cdn sites targets retrieving (#41)

* cdn sites: targets retrieving

* refactoring