Release version 13.0.0

Added
* Help text can be now invoked not only by `help` but also using `-h`
* Porcelain output for listing modules introduced with `-l` argument
  switch
* Read syslog messages from permanent storage (/srv/log/messages)
* DHCP diagnostics
* Additional DNS diagnostics for forwarders and Knot-resolver config

Changed
* Order numbers are now not part of module name but rather required and
  stripped part of module naming scheme
* Diagnostics script now exits with non-zero exit code when no output
  was generated when module execution is performed
* Help text now prints and script exits before fork to background when
  `-b` argument is used.
* `getopts` based argument parsing is not utilized allowing user to
  provide argument switches in any order and in more standard way
* Usage is now printed when invalid usage of script is detected
* Overall code cleanup

Removed
* Virtual module `help` as now help can be obtained with `-h` switch

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 
-## [Unreleased]
+## [13.0.0] - 2020-10-05
 
 ### Added