Bug with async mode is always true

[SaenkoDmitry]

Hello,
bug found in version 'org.audit4j:audit4j-core:2.5.0'

Problem:
It is not possible to set sync mode because async always is true

Solution:
It is needed to change line 53-54:

audit4j-core/src/main/java/org/audit4j/core/command/impl/MetadataCommand.java

Lines 53 to 54 in dc85691

	options.contains(ASYNC_OPTION);
	async = true;

to

if (options.contains(ASYNC_OPTION))
  async = true;