[Wiki] Update Release Notes for joynr 1.7.0
[Wiki] Update Release Notes for joynr 1.7.0

Change-Id: I1646ac8a23941b776b3582f414566dabc1122461

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr