Header version number is not up-to-date

[Klaim]

Hi, I'm the maintainer of the jsonxx package for build2 (see https://cppget.org/jsonxx?q=jsonxx and https://github.com/build2-packaging/jsonxx). (I had to package it because it was used in a project at work which buildsystem we changed to build2 recently).

I prepared the v1.0.1 package but we realized the header doesn't expose the right version number there: https://github.com/hjiang/jsonxx/blob/master/jsonxx.h#L22

[Klaim]

Also the version number and the pattern in the header do not match.