PTR records implementation#44

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artur99 wants to merge 9 commits intotrevoro:masterfrom

artur99:artur99-ptr-implementation

Commits on Jun 18, 2020

Added protocol entry for PTR
David VULTUR
committed
Added tests for PTR record
David VULTUR
committed
Added PTRRecord to docs
David VULTUR
committed
Added new entries to examples and readme
David VULTUR
committed
Removed older comments
David VULTUR
committed