2020-05-16 - 0.001
    + First version

2020-05-17 - 0.002
    + fix test cannot be run in other perl version

2020-05-17 - 0.003
    + change the year in Changes file

2020-05-18 - 0.004
    + adding git repo link to readme

2020-05-19 - 0.005
    + fix test from PAUSE

2020-12-02 - 0.006
    + fix the to_json misprototype issue

2020-12-02 - 0.007
    + backwards compatible change (// --> defined ?:)