version 1.0.0, compatible with Varnish 6.6
version 0.2.3, bugfix a race in object initialization
version 0.2.2, bugfixes zeroing data structures (cf. Varnish PR #3057)
Version 0.2.1, compatible with Varnish 6.3, bugfix release
Version 0.2.0, compatible with Varnish 6.3.