update changelog for release 0.3.0
update changelog for release 0.3.0

pact-foundation/pact-reference,pact-foundation/pact-mock-server,pact-foundation/pact-reference,pact-foundation/pact-reference,AssafKatz3/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,AssafKatz3/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,AssafKatz3/pact-reference,AssafKatz3/pact-reference