1.16:
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 * Fixup for strict_types

1.15:
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 * Fixup an old S9y Series 1 message variable
 * Raises serendipity requirement to 2.0

0.14:
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 * Added legal property bag information for gdpr/dsgvo

0.13:
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 * Set plugin consistencies
 * Use load language API - extends required Serendipity version to v.1.6

....

0.11:
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Support some edge scenarios with additional text/mails

0.10:
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Serendipity 1.5 compatibility