2017-01-01 create stable release 2.0 (2.00)
2017-01-02 Added option to limit amount of old versions to keep (2.01)
2017-01-03 Created check_config function to list all obvious config issues (2.02)
2017-01-10 force renew if FORCE_RENEWAL file exists (2.03)
2017-01-12 added drill, dig or host as alternatives to nslookup (2.04)
2017-01-18 bugfix issue #227 - error deleting csr if doesn't exist
2017-01-18 issue #228 check private key and account key are different (2.05)
2017-01-21 issue #231 mingw bugfix and typos in debug messages (2.06)
2017-01-29 issue #232 use neutral locale for date formatting (2.07)
2017-01-30 issue #243 compatibility with bash 3.0 (2.08)
2017-01-30 issue #243 additional compatibility with bash 3.0 (2.09)