add support for og:regdate

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (52705a3) 99.07% compared to head (2f0edfa) 99.07%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #112 +/- ## ======================================= Coverage 99.07% 99.07% ======================================= Files 8 8 Lines 867 867 ======================================= Hits 859 859 Misses 8 8 ```

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