Version history:

1.5.1   2019-04-24  'the new small features'
	- add asynchronous implementation of handle and writer
	- add parameters for %trait placeholder
	- add %color placeholder
	- add reusing handles from previous config file read
	- add possibility to backup and restore NDC and MDC values
	- add out-buffer parameter to std and file handle in configuration file
	- improve internal exceptions behaviour

1.4.2   2019-04-10  'better config file and zero length'
	- add length=0 support in %level placeholder
	- add support of using 'custom' arguments in custom's args in configuration file

1.4.1   2019-04-08  'callframe in writer pattern'
	- add callframe support in writer pattern

1.3.1   2019-04-07  'The first public release'
	- Production ready log library