What's been proposed before that wouldn't break previous applications is a numbering system like this: 10.0.0 10.0.1 10.0.2 10.0.3 ... 11.0.0 11.0.1 i.e. only change the "most-major" version number and always leave the "less-major" number as zero.
pgsql-hackers by date:
Соглашаюсь с условиями обработки персональных данных