Prepare release notes for 0.18.0
Prepare release notes for 0.18.0

rdelval/aurora,crashlytics/aurora,rdelval/aurora,thinker0/aurora,medallia/aurora,crashlytics/aurora,apache/aurora,crashlytics/aurora,thinker0/aurora,thinker0/aurora,crashlytics/aurora,thinker0/aurora,apache/aurora,thinker0/aurora,apache/aurora,medallia/aurora,rdelval/aurora,apache/aurora,rdelval/aurora,medallia/aurora,apache/aurora,rdelval/aurora,thinker0/aurora,medallia/aurora,crashlytics/aurora,medallia/aurora,crashlytics/aurora,medallia/aurora,rdelval/aurora,apache/aurora