Add changelog for 0.16.1
Add changelog for 0.16.1

Stackdriver/stackdriver-prometheus,prometheus/prometheus,adamron1/prometheus,PrFalken/prometheus,amorken/prometheus,datajet-io/prometheus,adamron1/prometheus,gottwald/prometheus,datajet-io/prometheus,dmilstein/prometheus,Conorbro/prometheus,AlekSi/prometheus,sudhi-vm/prometheus,keegancsmith/prometheus,tomwilkie/prometheus,slok/prometheus,mtanda/prometheus,tattsun/prometheus,AlekSi/prometheus,yanghongkjxy/prometheus,mtanda/prometheus,kangwoo/prometheus,brancz/prometheus,brancz/prometheus,PrFalken/prometheus,slok/prometheus,JavierZunzunegui/prometheus,Colstuwjx/prometheus,mtanda/prometheus,dmilstein/prometheus,datajet-io/prometheus,amorken/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,dmilstein/prometheus,gottwald/prometheus,agaoglu/prometheus,kangwoo/prometheus,tomwilkie/prometheus,keegancsmith/prometheus,sudhi-vm/prometheus,Colstuwjx/prometheus,tattsun/prometheus,kangwoo/prometheus,alileza/prometheus,keegancsmith/prometheus,Stackdriver/stackdriver-prometheus,alileza/prometheus,PrFalken/prometheus,adamron1/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,mtanda/prometheus,JavierZunzunegui/prometheus,Conorbro/prometheus,eliothedeman/prometheus,gottwald/prometheus,agaoglu/prometheus,dmilstein/prometheus,wrouesnel/prometheus,yanghongkjxy/prometheus,JavierZunzunegui/prometheus,eliothedeman/prometheus,wrouesnel/prometheus,iksaif/prometheus,keegancsmith/prometheus,agaoglu/prometheus,prometheus/prometheus,alileza/prometheus,Stackdriver/stackdriver-prometheus,GoogleCloudPlatform/prometheus,sudhi-vm/prometheus,SaltedMan/prometheus-annotated,iksaif/prometheus,kangwoo/prometheus,prometheus/prometheus,yanghongkjxy/prometheus,JavierZunzunegui/prometheus,dsymonds/prometheus,msiebuhr/prometheus,iksaif/prometheus,prometheus/prometheus,msiebuhr/prometheus,Conorbro/prometheus,agaoglu/prometheus,amorken/prometheus,AlekSi/prometheus,alileza/prometheus,tattsun/prometheus,kzittritsch/prometheus,kzittritsch/prometheus,ton31337/prometheus,amorken/prometheus,tattsun/prometheus,dsymonds/prometheus,yanghongkjxy/prometheus,SaltedMan/prometheus-annotated,GoogleCloudPlatform/prometheus,SaltedMan/prometheus-annotated,Stackdriver/stackdriver-prometheus,msiebuhr/prometheus,wrouesnel/prometheus,eliothedeman/prometheus,tomwilkie/prometheus,eliothedeman/prometheus,sudhi-vm/prometheus,Conorbro/prometheus,GoogleCloudPlatform/prometheus,adamron1/prometheus,SaltedMan/prometheus-annotated,wrouesnel/prometheus,kzittritsch/prometheus,ton31337/prometheus,brancz/prometheus,keegancsmith/prometheus,tomwilkie/prometheus,alileza/prometheus,dsymonds/prometheus,dsymonds/prometheus,Colstuwjx/prometheus,Gouthamve/prometheus,ton31337/prometheus,datajet-io/prometheus,brancz/prometheus,slok/prometheus,msiebuhr/prometheus,kzittritsch/prometheus,slok/prometheus,PrFalken/prometheus,gottwald/prometheus,ton31337/prometheus,AlekSi/prometheus,prometheus/prometheus,Colstuwjx/prometheus,iksaif/prometheus,Gouthamve/prometheus