check_pgbackrest 1.5

2019-03-18 - Version 1.5

Changelog:
  * order archived WALs list by filename to validate if none is missing
  * add --debug option to print some debug messages
  * add ignore-archived-since argument to ignore the archived WALs since the  provided interval
  * add --latest-archive-age-alert to define the max age of the latest archived WAL before raising a critical alert