[Release] Update release notes for joynr 1.3.1
[Release] Update release notes for joynr 1.3.1

Change-Id: I0bfb5d2c4b8b1ae4f8891c3732ae8b7b7ba83ea4

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