Semantic Versioning

[cerebrumy]

Hi creators of express-openapi-validator!
I recently had the problem that version 5.4.x is not backward compatible with version 5.3.x, i.e. existing code fails to build with the newer version. It is not a big deal, however, it is certainly helpful to stick to the semantic versioning rules: https://docs.npmjs.com/about-semantic-versioning. Was this a mistake with version 5.4? Sometimes it is not easy to oversee the impact of the changes, I know.
Thx for the code, I'm glad to have it!