update changelog for release 0.2.0
update changelog for release 0.2.0

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