Replace ClassImposteriser with ByteBuddyClassImposteriser
This may avoid problems with ClassImposteriser when using Java 11. See https://github.com/jmock-developers/jmock-library/releases/tag/2.10.0
This may avoid problems with ClassImposteriser when using Java 11. See https://github.com/jmock-developers/jmock-library/releases/tag/2.10.0