update changelog for release 2.4.18
update changelog for release 2.4.18

olga-vasylchenko/pact-jvm,algra/pact-jvm,DiUS/pact-jvm,algra/pact-jvm,DiUS/pact-jvm,Fitzoh/pact-jvm,flaregames/pact-jvm,Fitzoh/pact-jvm